61551512056 has 32 divisors (see below), whose sum is σ = 117048096000. Its totient is φ = 30339874656.

The previous prime is 61551512021. The next prime is 61551512069. The reversal of 61551512056 is 65021515516.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342595 + ... + 490381.

It is an arithmetic number, because the mean of its divisors is an integer number (3657753000).

Almost surely, 2^61551512056 is an apocalyptic number.

It is an amenable number.

61551512056 is a deficient number, since it is larger than the sum of its proper divisors (55496583944).

61551512056 is a wasteful number, since it uses less digits than its factorization.

61551512056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148531 (or 148527 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 37.

The spelling of 61551512056 in words is "sixty-one billion, five hundred fifty-one million, five hundred twelve thousand, fifty-six".