64670631555 has 16 divisors (see below), whose sum is σ = 106810850304. Its totient is φ = 33378390240.

The previous prime is 64670631523. The next prime is 64670631589. The reversal of 64670631555 is 55513607646.

64670631555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64670631555 - 2⁵ = 64670631523 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69537849 + ... + 69538778.

It is an arithmetic number, because the mean of its divisors is an integer number (6675678144).

Almost surely, 2^64670631555 is an apocalyptic number.

64670631555 is a deficient number, since it is larger than the sum of its proper divisors (42140218749).

64670631555 is a wasteful number, since it uses less digits than its factorization.

64670631555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139076666.

The product of its (nonzero) digits is 2268000, while the sum is 48.

The spelling of 64670631555 in words is "sixty-four billion, six hundred seventy million, six hundred thirty-one thousand, five hundred fifty-five".