64615566701 has 4 divisors (see below), whose sum is σ = 73846361952. Its totient is φ = 55384771452.

The previous prime is 64615566569. The next prime is 64615566727. The reversal of 64615566701 is 10766551646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64615566701 - 2²⁶ = 64548457837 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 (64615566401) 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, 4615397615 + ... + 4615397628.

It is an arithmetic number, because the mean of its divisors is an integer number (18461590488).

Almost surely, 2^64615566701 is an apocalyptic number.

It is an amenable number.

64615566701 is a deficient number, since it is larger than the sum of its proper divisors (9230795251).

64615566701 is an equidigital number, since it uses as much as digits as its factorization.

64615566701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9230795250.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 64615566701 in words is "sixty-four billion, six hundred fifteen million, five hundred sixty-six thousand, seven hundred one".