64815476458457 has 4 divisors (see below), whose sum is σ = 65019941684196. Its totient is φ = 64611011232720.

The previous prime is 64815476458441. The next prime is 64815476458463. The reversal of 64815476458457 is 75485467451846.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1187988822601 + 63627487635856 = 1089949^2 + 7976684^2 .

It is a cyclic number.

It is not a de Polignac number, because 64815476458457 - 2⁴ = 64815476458441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64815476458157) 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, 102232612394 + ... + 102232613027.

It is an arithmetic number, because the mean of its divisors is an integer number (16254985421049).

Almost surely, 2^{64815476458457} is an apocalyptic number.

It is an amenable number.

64815476458457 is a deficient number, since it is larger than the sum of its proper divisors (204465225739).

64815476458457 is a wasteful number, since it uses less digits than its factorization.

64815476458457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204465225738.

The product of its digits is 3612672000, while the sum is 74.

The spelling of 64815476458457 in words is "sixty-four trillion, eight hundred fifteen billion, four hundred seventy-six million, four hundred fifty-eight thousand, four hundred fifty-seven".