61977760572 has 96 divisors (see below), whose sum is σ = 179620672000. Its totient is φ = 16195790592.

The previous prime is 61977760547. The next prime is 61977760613. The reversal of 61977760572 is 27506777916.

It is a happy number.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 141322 + ... + 379377.

Almost surely, 2^61977760572 is an apocalyptic number.

It is an amenable number.

61977760572 is an abundant number, since it is smaller than the sum of its proper divisors (117642911428).

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

61977760572 is a wasteful number, since it uses less digits than its factorization.

61977760572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520835 (or 520833 counting only the distinct ones).

The product of its (nonzero) digits is 7779240, while the sum is 57.

The spelling of 61977760572 in words is "sixty-one billion, nine hundred seventy-seven million, seven hundred sixty thousand, five hundred seventy-two".