20117625640668 has 72 divisors (see below), whose sum is σ = 52494472867200. Its totient is φ = 6489412001280.

The previous prime is 20117625640579. The next prime is 20117625640669. The reversal of 20117625640668 is 86604652671102.

20117625640668 is a `hidden beast` number, since 2 + 0 + 1 + 1 + 7 + 625 + 6 + 4 + 0 + 6 + 6 + 8 = 666.

It is a super-2 number, since 2×20117625640668² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20117625640669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57241896 + ... + 57592272.

Almost surely, 2^{20117625640668} is an apocalyptic number.

It is an amenable number.

20117625640668 is an abundant number, since it is smaller than the sum of its proper divisors (32376847226532).

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

20117625640668 is a wasteful number, since it uses less digits than its factorization.

20117625640668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401867 (or 401862 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 20117625640668 in words is "twenty trillion, one hundred seventeen billion, six hundred twenty-five million, six hundred forty thousand, six hundred sixty-eight".