61612531537 has 16 divisors (see below), whose sum is σ = 70420544640. Its totient is φ = 53554369792.

The previous prime is 61612531507. The next prime is 61612531549. The reversal of 61612531537 is 73513521616.

61612531537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61612531537 is a prime.

It is a super-2 number, since 2×61612531537² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61612531537.

It is not an unprimeable number, because it can be changed into a prime (61612531507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2705503 + ... + 2728180.

It is an arithmetic number, because the mean of its divisors is an integer number (4401284040).

Almost surely, 2^61612531537 is an apocalyptic number.

It is an amenable number.

61612531537 is a deficient number, since it is larger than the sum of its proper divisors (8808013103).

61612531537 is a wasteful number, since it uses less digits than its factorization.

61612531537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5433752.

The product of its digits is 113400, while the sum is 40.

The spelling of 61612531537 in words is "sixty-one billion, six hundred twelve million, five hundred thirty-one thousand, five hundred thirty-seven".