61864513599 has 8 divisors (see below), whose sum is σ = 94269735040. Its totient is φ = 35351150616.

The previous prime is 61864513547. The next prime is 61864513651. The reversal of 61864513599 is 99531546816.

It is an interprime number because it is at equal distance from previous prime (61864513547) and next prime (61864513651).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61864513599 - 2²⁰ = 61863465023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61864513199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1472964589 + ... + 1472964630.

It is an arithmetic number, because the mean of its divisors is an integer number (11783716880).

Almost surely, 2^61864513599 is an apocalyptic number.

61864513599 is a deficient number, since it is larger than the sum of its proper divisors (32405221441).

61864513599 is a wasteful number, since it uses less digits than its factorization.

61864513599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2945929229.

The product of its digits is 6998400, while the sum is 57.

The spelling of 61864513599 in words is "sixty-one billion, eight hundred sixty-four million, five hundred thirteen thousand, five hundred ninety-nine".