61538455560 has 64 divisors (see below), whose sum is σ = 184632022080. Its totient is φ = 16408774400.

The previous prime is 61538455547. The next prime is 61538455603. The reversal of 61538455560 is 6555483516.

It is a happy 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, 2195635 + ... + 2223485.

It is an arithmetic number, because the mean of its divisors is an integer number (2884875345).

Almost surely, 2^61538455560 is an apocalyptic number.

61538455560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61538455560 is an abundant number, since it is smaller than the sum of its proper divisors (123093566520).

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

61538455560 is a wasteful number, since it uses less digits than its factorization.

61538455560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46278 (or 46274 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 48.

The spelling of 61538455560 in words is "sixty-one billion, five hundred thirty-eight million, four hundred fifty-five thousand, five hundred sixty".