61913632729 has 16 divisors (see below), whose sum is σ = 69153355264. Its totient is φ = 55045267200.

The previous prime is 61913632727. The next prime is 61913632733. The reversal of 61913632729 is 92723631916.

It is a cyclic number.

It is not a de Polignac number, because 61913632729 - 2¹ = 61913632727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61913632727) 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, 279024 + ... + 449089.

It is an arithmetic number, because the mean of its divisors is an integer number (4322084704).

Almost surely, 2^61913632729 is an apocalyptic number.

It is an amenable number.

61913632729 is a deficient number, since it is larger than the sum of its proper divisors (7239722535).

61913632729 is a wasteful number, since it uses less digits than its factorization.

61913632729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728368.

The product of its digits is 734832, while the sum is 49.

The spelling of 61913632729 in words is "sixty-one billion, nine hundred thirteen million, six hundred thirty-two thousand, seven hundred twenty-nine".