61618600431 has 12 divisors (see below), whose sum is σ = 89285420952. Its totient is φ = 40949478096.

The previous prime is 61618600403. The next prime is 61618600457. The reversal of 61618600431 is 13400681616.

61618600431 is a `hidden beast` number, since 6 + 1 + 6 + 1 + 8 + 600 + 43 + 1 = 666.

It is not a de Polignac number, because 61618600431 - 2⁵ = 61618600399 is a prime.

It is a super-2 number, since 2×61618600431² (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 (61618600471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10796061 + ... + 10801766.

It is an arithmetic number, because the mean of its divisors is an integer number (7440451746).

Almost surely, 2^61618600431 is an apocalyptic number.

61618600431 is a deficient number, since it is larger than the sum of its proper divisors (27666820521).

61618600431 is a wasteful number, since it uses less digits than its factorization.

61618600431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21598150 (or 21598147 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 61618600431 in words is "sixty-one billion, six hundred eighteen million, six hundred thousand, four hundred thirty-one".