61551774448640 has 176 divisors, whose sum is σ = 171929167468992. Its totient is φ = 20705286291456.

The previous prime is 61551774448639. The next prime is 61551774448663. The reversal of 61551774448640 is 4684447715516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14302409 + ... + 18101448.

Almost surely, 2^{61551774448640} is an apocalyptic number.

It is an amenable number.

61551774448640 is an abundant number, since it is smaller than the sum of its proper divisors (110377393020352).

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

61551774448640 is a wasteful number, since it uses less digits than its factorization.

61551774448640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32403942 (or 32403924 counting only the distinct ones).

The product of its (nonzero) digits is 90316800, while the sum is 62.

The spelling of 61551774448640 in words is "sixty-one trillion, five hundred fifty-one billion, seven hundred seventy-four million, four hundred forty-eight thousand, six hundred forty".