61556386432 has 32 divisors (see below), whose sum is σ = 122643064980. Its totient is φ = 30775382016.

The previous prime is 61556386391. The next prime is 61556386457. The reversal of 61556386432 is 23468365516.

It can be written as a sum of positive squares in 2 ways, for example, as 50366131776 + 11190254656 = 224424^2 + 105784^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2644798 + ... + 2667970.

Almost surely, 2^61556386432 is an apocalyptic number.

It is an amenable number.

61556386432 is a deficient number, since it is larger than the sum of its proper divisors (61086678548).

61556386432 is a wasteful number, since it uses less digits than its factorization.

61556386432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43940 (or 43928 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 49.

The spelling of 61556386432 in words is "sixty-one billion, five hundred fifty-six million, three hundred eighty-six thousand, four hundred thirty-two".