61031513072 has 20 divisors (see below), whose sum is σ = 118311950616. Its totient is φ = 30499396800.

The previous prime is 61031513071. The next prime is 61031513117. The reversal of 61031513072 is 27031513016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61031513071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 991679 + ... + 1051422.

Almost surely, 2^61031513072 is an apocalyptic number.

It is an amenable number.

61031513072 is a deficient number, since it is larger than the sum of its proper divisors (57280437544).

61031513072 is a wasteful number, since it uses less digits than its factorization.

61031513072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2044976 (or 2044970 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 29.

The spelling of 61031513072 in words is "sixty-one billion, thirty-one million, five hundred thirteen thousand, seventy-two".