2051665617756 has 12 divisors (see below), whose sum is σ = 4787219774792. Its totient is φ = 683888539248.

The previous prime is 2051665617733. The next prime is 2051665617767. The reversal of 2051665617756 is 6577165661502.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 2051665617696 and 2051665617705.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85486067395 + ... + 85486067418.

Almost surely, 2^{2051665617756} is an apocalyptic number.

It is an amenable number.

2051665617756 is an abundant number, since it is smaller than the sum of its proper divisors (2735554157036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2051665617756 is a wasteful number, since it uses less digits than its factorization.

2051665617756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170972134820 (or 170972134818 counting only the distinct ones).

The product of its (nonzero) digits is 15876000, while the sum is 57.

The spelling of 2051665617756 in words is "two trillion, fifty-one billion, six hundred sixty-five million, six hundred seventeen thousand, seven hundred fifty-six".