2155499617 has 4 divisors (see below), whose sum is σ = 2229827220. Its totient is φ = 2081172016.

The previous prime is 2155499603. The next prime is 2155499627. The reversal of 2155499617 is 7169945512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1429520481 + 725979136 = 37809^2 + 26944^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155499617 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155499627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37163758 + ... + 37163815.

It is an arithmetic number, because the mean of its divisors is an integer number (557456805).

Almost surely, 2^2155499617 is an apocalyptic number.

It is an amenable number.

2155499617 is a deficient number, since it is larger than the sum of its proper divisors (74327603).

2155499617 is an equidigital number, since it uses as much as digits as its factorization.

2155499617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74327602.

The product of its digits is 680400, while the sum is 49.

The square root of 2155499617 is about 46427.3584969035. The cubic root of 2155499617 is about 1291.7624322772.

The spelling of 2155499617 in words is "two billion, one hundred fifty-five million, four hundred ninety-nine thousand, six hundred seventeen".