61515668423 has 16 divisors (see below), whose sum is σ = 69176415744. Its totient is φ = 54221900160.

The previous prime is 61515668419. The next prime is 61515668449. The reversal of 61515668423 is 32486651516.

It is a cyclic number.

It is not a de Polignac number, because 61515668423 - 2² = 61515668419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61515668023) 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, 500690 + ... + 611327.

It is an arithmetic number, because the mean of its divisors is an integer number (4323525984).

Almost surely, 2^61515668423 is an apocalyptic number.

61515668423 is a deficient number, since it is larger than the sum of its proper divisors (7660747321).

61515668423 is a wasteful number, since it uses less digits than its factorization.

61515668423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112182.

The product of its digits is 1036800, while the sum is 47.

The spelling of 61515668423 in words is "sixty-one billion, five hundred fifteen million, six hundred sixty-eight thousand, four hundred twenty-three".