2156520064709 has 16 divisors (see below), whose sum is σ = 2181653520000. Its totient is φ = 2131463073600.

The previous prime is 2156520064681. The next prime is 2156520064739. The reversal of 2156520064709 is 9074600256512.

It is a cyclic number.

It is not a de Polignac number, because 2156520064709 - 2⁴⁰ = 1057008436933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156520064739) 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, 370088054 + ... + 370093880.

It is an arithmetic number, because the mean of its divisors is an integer number (136353345000).

Almost surely, 2^{2156520064709} is an apocalyptic number.

It is an amenable number.

2156520064709 is a deficient number, since it is larger than the sum of its proper divisors (25133455291).

2156520064709 is a wasteful number, since it uses less digits than its factorization.

2156520064709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11660.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 2156520064709 in words is "two trillion, one hundred fifty-six billion, five hundred twenty million, sixty-four thousand, seven hundred nine".