667634842864 has 40 divisors (see below), whose sum is σ = 1411395022080. Its totient is φ = 303414955200.

The previous prime is 667634842859. The next prime is 667634842873. The reversal of 667634842864 is 468248436766.

667634842864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 667634842796 and 667634842805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 627679 + ... + 1315009.

It is an arithmetic number, because the mean of its divisors is an integer number (35284875552).

Almost surely, 2^667634842864 is an apocalyptic number.

It is an amenable number.

667634842864 is an abundant number, since it is smaller than the sum of its proper divisors (743760179216).

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

667634842864 is a wasteful number, since it uses less digits than its factorization.

667634842864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692869 (or 692863 counting only the distinct ones).

The product of its digits is 222953472, while the sum is 64.

The spelling of 667634842864 in words is "six hundred sixty-seven billion, six hundred thirty-four million, eight hundred forty-two thousand, eight hundred sixty-four".