61765407431 has 24 divisors (see below), whose sum is σ = 80740656864. Its totient is φ = 46744568640.

The previous prime is 61765407427. The next prime is 61765407503. The reversal of 61765407431 is 13470456716.

It is not a de Polignac number, because 61765407431 - 2² = 61765407427 is a prime.

It is a super-2 number, since 2×61765407431² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61765407631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2093240 + ... + 2122541.

It is an arithmetic number, because the mean of its divisors is an integer number (3364194036).

Almost surely, 2^61765407431 is an apocalyptic number.

61765407431 is a deficient number, since it is larger than the sum of its proper divisors (18975249433).

61765407431 is a wasteful number, since it uses less digits than its factorization.

61765407431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4215831 (or 4215824 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 44.

The spelling of 61765407431 in words is "sixty-one billion, seven hundred sixty-five million, four hundred seven thousand, four hundred thirty-one".