61513604165 has 32 divisors (see below), whose sum is σ = 80731625856. Its totient is φ = 44719361280.

The previous prime is 61513604149. The next prime is 61513604189. The reversal of 61513604165 is 56140631516.

It is not a de Polignac number, because 61513604165 - 2⁴ = 61513604149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9068075 + ... + 9074855.

It is an arithmetic number, because the mean of its divisors is an integer number (2522863308).

Almost surely, 2^61513604165 is an apocalyptic number.

61513604165 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61513604165 is a deficient number, since it is larger than the sum of its proper divisors (19218021691).

61513604165 is a wasteful number, since it uses less digits than its factorization.

61513604165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8949.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 61513604165 in words is "sixty-one billion, five hundred thirteen million, six hundred four thousand, one hundred sixty-five".