2656001521 has 4 divisors (see below), whose sum is σ = 2771479872. Its totient is φ = 2540523172.

The previous prime is 2656001519. The next prime is 2656001531. The reversal of 2656001521 is 1251006562.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2656001521 - 2¹ = 2656001519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2656001521.

It is not an unprimeable number, because it can be changed into a prime (2656001531) 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, 57739141 + ... + 57739186.

It is an arithmetic number, because the mean of its divisors is an integer number (692869968).

Almost surely, 2^2656001521 is an apocalyptic number.

It is an amenable number.

2656001521 is a deficient number, since it is larger than the sum of its proper divisors (115478351).

2656001521 is a wasteful number, since it uses less digits than its factorization.

2656001521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115478350.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 2656001521 is about 51536.4096634603. The cubic root of 2656001521 is about 1384.8713788814.

The spelling of 2656001521 in words is "two billion, six hundred fifty-six million, one thousand, five hundred twenty-one".