61165566556 has 24 divisors (see below), whose sum is σ = 108175514720. Its totient is φ = 30258807552.

The previous prime is 61165566509. The next prime is 61165566559. The reversal of 61165566556 is 65566556116.

It is a super-2 number, since 2×61165566556² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61165566559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399400 + ... + 530896.

Almost surely, 2^61165566556 is an apocalyptic number.

It is an amenable number.

61165566556 is a deficient number, since it is larger than the sum of its proper divisors (47009948164).

61165566556 is a wasteful number, since it uses less digits than its factorization.

61165566556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132733 (or 132731 counting only the distinct ones).

The product of its digits is 4860000, while the sum is 52.

The spelling of 61165566556 in words is "sixty-one billion, one hundred sixty-five million, five hundred sixty-six thousand, five hundred fifty-six".