61511111056560 has 160 divisors (see below), whose sum is σ = 208030055224320. Its totient is φ = 14911020236800.

The previous prime is 61511111056553. The next prime is 61511111056561. The reversal of 61511111056560 is 6565011111516.

It is not an unprimeable number, because it can be changed into a prime (61511111056561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51793081 + ... + 52967399.

It is an arithmetic number, because the mean of its divisors is an integer number (1300187845152).

Almost surely, 2^{61511111056560} is an apocalyptic number.

61511111056560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61511111056560 is an abundant number, since it is smaller than the sum of its proper divisors (146518944167760).

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

61511111056560 is a wasteful number, since it uses less digits than its factorization.

61511111056560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194187 (or 1194181 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 39.

The spelling of 61511111056560 in words is "sixty-one trillion, five hundred eleven billion, one hundred eleven million, fifty-six thousand, five hundred sixty".