61640143525656 has 64 divisors (see below), whose sum is σ = 171382792380000. Its totient is φ = 20527493931648.

The previous prime is 61640143525651. The next prime is 61640143525711. The reversal of 61640143525656 is 65652534104616.

61640143525656 is a `hidden beast` number, since 6 + 1 + 6 + 40 + 1 + 4 + 35 + 2 + 565 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61640143525651) 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, 133244791 + ... + 133706598.

Almost surely, 2^{61640143525656} is an apocalyptic number.

It is an amenable number.

61640143525656 is an abundant number, since it is smaller than the sum of its proper divisors (109742648854344).

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

61640143525656 is a wasteful number, since it uses less digits than its factorization.

61640143525656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266952473 (or 266952463 counting only the distinct ones).

The product of its (nonzero) digits is 15552000, while the sum is 54.

The spelling of 61640143525656 in words is "sixty-one trillion, six hundred forty billion, one hundred forty-three million, five hundred twenty-five thousand, six hundred fifty-six".