2495902766921 has 4 divisors (see below), whose sum is σ = 2511800236932. Its totient is φ = 2480005296912.

The previous prime is 2495902766891. The next prime is 2495902766953. The reversal of 2495902766921 is 1296672095942.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1581899845696 + 914002921225 = 1257736^2 + 956035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2495902766921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2495902766321) 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, 7948734770 + ... + 7948735083.

It is an arithmetic number, because the mean of its divisors is an integer number (627950059233).

Almost surely, 2^{2495902766921} is an apocalyptic number.

It is an amenable number.

2495902766921 is a deficient number, since it is larger than the sum of its proper divisors (15897470011).

2495902766921 is a wasteful number, since it uses less digits than its factorization.

2495902766921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15897470010.

The product of its (nonzero) digits is 29393280, while the sum is 62.

The spelling of 2495902766921 in words is "two trillion, four hundred ninety-five billion, nine hundred two million, seven hundred sixty-six thousand, nine hundred twenty-one".