61797919922 has 6 divisors (see below), whose sum is σ = 92697407229. Its totient is φ = 30898784180.

The previous prime is 61797919913. The next prime is 61797919927. The reversal of 61797919922 is 22991979716.

It can be written as a sum of positive squares in 2 ways, for example, as 61746783121 + 51136801 = 248489^2 + 7151^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=175781.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61797919927) by changing a digit.

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 2 ways as a sum of consecutive naturals, for example, 263672 + ... + 439452.

Almost surely, 2^61797919922 is an apocalyptic number.

61797919922 is a deficient number, since it is larger than the sum of its proper divisors (30899487307).

61797919922 is an frugal number, since it uses more digits than its factorization.

61797919922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351564 (or 175783 counting only the distinct ones).

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

The spelling of 61797919922 in words is "sixty-one billion, seven hundred ninety-seven million, nine hundred nineteen thousand, nine hundred twenty-two".