61639580556 has 60 divisors (see below), whose sum is σ = 162406951168. Its totient is φ = 20384729568.

The previous prime is 61639580489. The next prime is 61639580557. The reversal of 61639580556 is 65508593616.

It is a happy number.

61639580556 is a `hidden beast` number, since 6 + 1 + 6 + 3 + 9 + 5 + 80 + 556 = 666.

It is a super-2 number, since 2×61639580556² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (61639580557) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 707851 + ... + 790146.

Almost surely, 2^61639580556 is an apocalyptic number.

It is an amenable number.

61639580556 is an abundant number, since it is smaller than the sum of its proper divisors (100767370612).

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

61639580556 is a wasteful number, since it uses less digits than its factorization.

61639580556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1498140 (or 1498129 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 54.

The spelling of 61639580556 in words is "sixty-one billion, six hundred thirty-nine million, five hundred eighty thousand, five hundred fifty-six".