61997179940 has 48 divisors (see below), whose sum is σ = 135630149760. Its totient is φ = 23783934720.

The previous prime is 61997179921. The next prime is 61997179943. The reversal of 61997179940 is 4997179916.

61997179940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (61997179943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 592352 + ... + 689111.

It is an arithmetic number, because the mean of its divisors is an integer number (2825628120).

Almost surely, 2^61997179940 is an apocalyptic number.

It is an amenable number.

61997179940 is an abundant number, since it is smaller than the sum of its proper divisors (73632969820).

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

61997179940 is a wasteful number, since it uses less digits than its factorization.

61997179940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281572 (or 1281570 counting only the distinct ones).

The product of its (nonzero) digits is 7715736, while the sum is 62.

The spelling of 61997179940 in words is "sixty-one billion, nine hundred ninety-seven million, one hundred seventy-nine thousand, nine hundred forty".