64267256815 has 4 divisors (see below), whose sum is σ = 77120708184. Its totient is φ = 51413805448.

The previous prime is 64267256797. The next prime is 64267256831. The reversal of 64267256815 is 51865276246.

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

It is a cyclic number.

It is not a de Polignac number, because 64267256815 - 2⁷ = 64267256687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6426725677 + ... + 6426725686.

It is an arithmetic number, because the mean of its divisors is an integer number (19280177046).

Almost surely, 2^64267256815 is an apocalyptic number.

64267256815 is a deficient number, since it is larger than the sum of its proper divisors (12853451369).

64267256815 is a wasteful number, since it uses less digits than its factorization.

64267256815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12853451368.

The product of its digits is 4838400, while the sum is 52.

The spelling of 64267256815 in words is "sixty-four billion, two hundred sixty-seven million, two hundred fifty-six thousand, eight hundred fifteen".