61656500980 has 48 divisors (see below), whose sum is σ = 130410000000. Its totient is φ = 24485361536.

The previous prime is 61656500909. The next prime is 61656500987. The reversal of 61656500980 is 8900565616.

61656500980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×61656500980² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61656500980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61656500987) 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, 8933571 + ... + 8940469.

It is an arithmetic number, because the mean of its divisors is an integer number (2716875000).

Almost surely, 2^61656500980 is an apocalyptic number.

It is an amenable number.

61656500980 is an abundant number, since it is smaller than the sum of its proper divisors (68753499020).

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

61656500980 is a wasteful number, since it uses less digits than its factorization.

61656500980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10056 (or 10054 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 61656500980 in words is "sixty-one billion, six hundred fifty-six million, five hundred thousand, nine hundred eighty".