2661256507 has 16 divisors (see below), whose sum is σ = 3278100672. Its totient is φ = 2103868800.

The previous prime is 2661256457. The next prime is 2661256553. The reversal of 2661256507 is 7056521662.

It is a cyclic number.

It is not a de Polignac number, because 2661256507 - 2³¹ = 513772859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2661256507.

It is not an unprimeable number, because it can be changed into a prime (2661256567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104757 + ... + 127657.

It is an arithmetic number, because the mean of its divisors is an integer number (204881292).

Almost surely, 2^2661256507 is an apocalyptic number.

2661256507 is a deficient number, since it is larger than the sum of its proper divisors (616844165).

2661256507 is a wasteful number, since it uses less digits than its factorization.

2661256507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24198.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 2661256507 is about 51587.3677076084. The cubic root of 2661256507 is about 1385.7841149801.

The spelling of 2661256507 in words is "two billion, six hundred sixty-one million, two hundred fifty-six thousand, five hundred seven".