2661604311615 has 64 divisors (see below), whose sum is σ = 4366916928000. Its totient is φ = 1383822835200.

The previous prime is 2661604311529. The next prime is 2661604311617. The reversal of 2661604311615 is 5161134061662.

It is not a de Polignac number, because 2661604311615 - 2¹² = 2661604307519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661604311617) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 179575905 + ... + 179590725.

It is an arithmetic number, because the mean of its divisors is an integer number (68233077000).

Almost surely, 2^{2661604311615} is an apocalyptic number.

2661604311615 is a deficient number, since it is larger than the sum of its proper divisors (1705312616385).

2661604311615 is a wasteful number, since it uses less digits than its factorization.

2661604311615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16568.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 2661604311615 in words is "two trillion, six hundred sixty-one billion, six hundred four million, three hundred eleven thousand, six hundred fifteen".