667216045836 has 18 divisors (see below), whose sum is σ = 1686573893732. Its totient is φ = 222405348600.

The previous prime is 667216045789. The next prime is 667216045871. The reversal of 667216045836 is 638540612766.

667216045836 is a `hidden beast` number, since 6 + 6 + 7 + 21 + 604 + 5 + 8 + 3 + 6 = 666.

667216045836 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9266889490 + ... + 9266889561.

Almost surely, 2^667216045836 is an apocalyptic number.

It is an amenable number.

667216045836 is an abundant number, since it is smaller than the sum of its proper divisors (1019357847896).

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

667216045836 is a wasteful number, since it uses less digits than its factorization.

667216045836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18533779061 (or 18533779056 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 667216045836 in words is "six hundred sixty-seven billion, two hundred sixteen million, forty-five thousand, eight hundred thirty-six".