64978612806 has 16 divisors (see below), whose sum is σ = 129963368448. Its totient is φ = 21658513800.

The previous prime is 64978612801. The next prime is 64978612807. The reversal of 64978612806 is 60821687946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64978612801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112230 + ... + 377561.

It is an arithmetic number, because the mean of its divisors is an integer number (8122710528).

Almost surely, 2^64978612806 is an apocalyptic number.

64978612806 is an abundant number, since it is smaller than the sum of its proper divisors (64984755642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64978612806 is a wasteful number, since it uses less digits than its factorization.

64978612806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511907.

The product of its (nonzero) digits is 6967296, while the sum is 57.

The spelling of 64978612806 in words is "sixty-four billion, nine hundred seventy-eight million, six hundred twelve thousand, eight hundred six".