16640261171 has 4 divisors (see below), whose sum is σ = 16640593344. Its totient is φ = 16639929000.

The previous prime is 16640261153. The next prime is 16640261173. The reversal of 16640261171 is 17116204661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16640261171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16640261173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73880 + ... + 196821.

It is an arithmetic number, because the mean of its divisors is an integer number (4160148336).

Almost surely, 2^16640261171 is an apocalyptic number.

16640261171 is a deficient number, since it is larger than the sum of its proper divisors (332173).

16640261171 is an equidigital number, since it uses as much as digits as its factorization.

16640261171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332172.

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 16640261171 in words is "sixteen billion, six hundred forty million, two hundred sixty-one thousand, one hundred seventy-one".