61130917566 has 56 divisors (see below), whose sum is σ = 144717615720. Its totient is φ = 19304491536.

The previous prime is 61130917553. The next prime is 61130917571. The reversal of 61130917566 is 66571903116.

61130917566 is a `hidden beast` number, since 61 + 13 + 0 + 9 + 17 + 566 = 666.

It is a super-2 number, since 2×61130917566² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1075665 + ... + 1131068.

Almost surely, 2^61130917566 is an apocalyptic number.

61130917566 is an abundant number, since it is smaller than the sum of its proper divisors (83586698154).

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

61130917566 is a wasteful number, since it uses less digits than its factorization.

61130917566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206772 (or 2206757 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The spelling of 61130917566 in words is "sixty-one billion, one hundred thirty million, nine hundred seventeen thousand, five hundred sixty-six".