2156657626009 has 4 divisors (see below), whose sum is σ = 2226227226880. Its totient is φ = 2087088025140.

The previous prime is 2156657626001. The next prime is 2156657626073. The reversal of 2156657626009 is 9006267566512.

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 2156657626009 - 2³ = 2156657626001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156657626001) 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, 34784800389 + ... + 34784800450.

It is an arithmetic number, because the mean of its divisors is an integer number (556556806720).

Almost surely, 2^{2156657626009} is an apocalyptic number.

It is an amenable number.

2156657626009 is a deficient number, since it is larger than the sum of its proper divisors (69569600871).

2156657626009 is an equidigital number, since it uses as much as digits as its factorization.

2156657626009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69569600870.

The product of its (nonzero) digits is 8164800, while the sum is 55.

The spelling of 2156657626009 in words is "two trillion, one hundred fifty-six billion, six hundred fifty-seven million, six hundred twenty-six thousand, nine".