667815322680 has 128 divisors (see below), whose sum is σ = 2428419398400. Its totient is φ = 161894620800.

The previous prime is 667815322679. The next prime is 667815322687. The reversal of 667815322680 is 86223518766.

667815322680 is a `hidden beast` number, since 6 + 6 + 7 + 8 + 1 + 532 + 26 + 80 = 666.

667815322680 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 Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667815322687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28094826 + ... + 28118585.

It is an arithmetic number, because the mean of its divisors is an integer number (18972026550).

Almost surely, 2^667815322680 is an apocalyptic number.

667815322680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

667815322680 is an abundant number, since it is smaller than the sum of its proper divisors (1760604075720).

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

667815322680 is a wasteful number, since it uses less digits than its factorization.

667815322680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56213442 (or 56213432 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 667815322680 in words is "six hundred sixty-seven billion, eight hundred fifteen million, three hundred twenty-two thousand, six hundred eighty".