61791211881 has 32 divisors (see below), whose sum is σ = 105944371200. Its totient is φ = 34862302800.

The previous prime is 61791211871. The next prime is 61791211897. The reversal of 61791211881 is 18811219716.

61791211881 is a `hidden beast` number, since 617 + 9 + 1 + 21 + 1 + 8 + 8 + 1 = 666.

It is not a de Polignac number, because 61791211881 - 2⁵ = 61791211849 is a prime.

It is a super-3 number, since 3×61791211881³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (61791211841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2054295 + ... + 2084156.

It is an arithmetic number, because the mean of its divisors is an integer number (3310761600).

Almost surely, 2^61791211881 is an apocalyptic number.

It is an amenable number.

61791211881 is a deficient number, since it is larger than the sum of its proper divisors (44153159319).

61791211881 is a wasteful number, since it uses less digits than its factorization.

61791211881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4138546 (or 4138540 counting only the distinct ones).

The product of its digits is 48384, while the sum is 45.

The spelling of 61791211881 in words is "sixty-one billion, seven hundred ninety-one million, two hundred eleven thousand, eight hundred eighty-one".