2609521655 has 16 divisors (see below), whose sum is σ = 3549796320. Its totient is φ = 1825607808.

The previous prime is 2609521631. The next prime is 2609521667. The reversal of 2609521655 is 5561259062.

It is a cyclic number.

It is not a de Polignac number, because 2609521655 - 2⁸ = 2609521399 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1055252 + ... + 1057721.

It is an arithmetic number, because the mean of its divisors is an integer number (221862270).

Almost surely, 2^2609521655 is an apocalyptic number.

2609521655 is a deficient number, since it is larger than the sum of its proper divisors (940274665).

2609521655 is a wasteful number, since it uses less digits than its factorization.

2609521655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2113010.

The product of its (nonzero) digits is 162000, while the sum is 41.

The square root of 2609521655 is about 51083.4773189923. The cubic root of 2609521655 is about 1376.7454030900.

The spelling of 2609521655 in words is "two billion, six hundred nine million, five hundred twenty-one thousand, six hundred fifty-five".