61562157831 has 24 divisors (see below), whose sum is σ = 89186404320. Its totient is φ = 40920101376.

The previous prime is 61562157739. The next prime is 61562157889. The reversal of 61562157831 is 13875126516.

61562157831 is a `hidden beast` number, since 6 + 1 + 56 + 21 + 578 + 3 + 1 = 666.

It is not a de Polignac number, because 61562157831 - 2²⁹ = 61025286919 is a prime.

It is a super-2 number, since 2×61562157831² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61562157931) 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, 4535551 + ... + 4549103.

It is an arithmetic number, because the mean of its divisors is an integer number (3716100180).

Almost surely, 2^61562157831 is an apocalyptic number.

61562157831 is a deficient number, since it is larger than the sum of its proper divisors (27624246489).

61562157831 is a wasteful number, since it uses less digits than its factorization.

61562157831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15015 (or 15012 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The spelling of 61562157831 in words is "sixty-one billion, five hundred sixty-two million, one hundred fifty-seven thousand, eight hundred thirty-one".