64655803857 has 4 divisors (see below), whose sum is σ = 86207738480. Its totient is φ = 43103869236.

The previous prime is 64655803829. The next prime is 64655803903. The reversal of 64655803857 is 75830855646.

64655803857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 64655803857 - 2¹⁰ = 64655802833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64655803797 and 64655803806.

It is not an unprimeable number, because it can be changed into a prime (64655803657) 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, 10775967307 + ... + 10775967312.

It is an arithmetic number, because the mean of its divisors is an integer number (21551934620).

Almost surely, 2^64655803857 is an apocalyptic number.

It is an amenable number.

64655803857 is a deficient number, since it is larger than the sum of its proper divisors (21551934623).

64655803857 is a wasteful number, since it uses less digits than its factorization.

64655803857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21551934622.

The product of its (nonzero) digits is 24192000, while the sum is 57.

The spelling of 64655803857 in words is "sixty-four billion, six hundred fifty-five million, eight hundred three thousand, eight hundred fifty-seven".