20256750659791 has 8 divisors (see below), whose sum is σ = 21750413302944. Its totient is φ = 18796653469440.

The previous prime is 20256750659767. The next prime is 20256750659851. The reversal of 20256750659791 is 19795605765202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20256750659791 is a prime.

It is a super-2 number, since 2×20256750659791² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20256750659191) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8391361950 + ... + 8391364363.

It is an arithmetic number, because the mean of its divisors is an integer number (2718801662868).

Almost surely, 2^{20256750659791} is an apocalyptic number.

20256750659791 is a deficient number, since it is larger than the sum of its proper divisors (1493662643153).

20256750659791 is a wasteful number, since it uses less digits than its factorization.

20256750659791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16782726401.

The product of its (nonzero) digits is 71442000, while the sum is 64.

The spelling of 20256750659791 in words is "twenty trillion, two hundred fifty-six billion, seven hundred fifty million, six hundred fifty-nine thousand, seven hundred ninety-one".