61621975872 has 84 divisors (see below), whose sum is σ = 185924525280. Its totient is φ = 19459567872.

The previous prime is 61621975781. The next prime is 61621975879. The reversal of 61621975872 is 27857912616.

61621975872 is a `hidden beast` number, since 6 + 1 + 621 + 9 + 7 + 5 + 8 + 7 + 2 = 666.

61621975872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61621975879) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2804388 + ... + 2826275.

Almost surely, 2^61621975872 is an apocalyptic number.

It is an amenable number.

61621975872 is an abundant number, since it is smaller than the sum of its proper divisors (124302549408).

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

61621975872 is a wasteful number, since it uses less digits than its factorization.

61621975872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5630700 (or 5630687 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The spelling of 61621975872 in words is "sixty-one billion, six hundred twenty-one million, nine hundred seventy-five thousand, eight hundred seventy-two".