61655188509980 has 48 divisors (see below), whose sum is σ = 139441435906080. Its totient is φ = 22764036642048.

The previous prime is 61655188509961. The next prime is 61655188510009. The reversal of 61655188509980 is 8990588155616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1238507 + ... + 11173373.

It is an arithmetic number, because the mean of its divisors is an integer number (2905029914710).

Almost surely, 2^{61655188509980} is an apocalyptic number.

It is an amenable number.

61655188509980 is an abundant number, since it is smaller than the sum of its proper divisors (77786247396100).

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

61655188509980 is a wasteful number, since it uses less digits than its factorization.

61655188509980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9958758 (or 9958756 counting only the distinct ones).

The product of its (nonzero) digits is 186624000, while the sum is 71.

The spelling of 61655188509980 in words is "sixty-one trillion, six hundred fifty-five billion, one hundred eighty-eight million, five hundred nine thousand, nine hundred eighty".