61357756560 has 80 divisors (see below), whose sum is σ = 193797935424. Its totient is φ = 16053346816.

The previous prime is 61357756543. The next prime is 61357756567. The reversal of 61357756560 is 6565775316.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (61357756567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2399142 + ... + 2424581.

Almost surely, 2^61357756560 is an apocalyptic number.

61357756560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61357756560 is an abundant number, since it is smaller than the sum of its proper divisors (132440178864).

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

61357756560 is a wasteful number, since it uses less digits than its factorization.

61357756560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4823792 (or 4823786 counting only the distinct ones).

The product of its (nonzero) digits is 3969000, while the sum is 51.

The spelling of 61357756560 in words is "sixty-one billion, three hundred fifty-seven million, seven hundred fifty-six thousand, five hundred sixty".