667428167872 has 28 divisors (see below), whose sum is σ = 1324913433480. Its totient is φ = 333591712256.

The previous prime is 667428167867. The next prime is 667428167951. The reversal of 667428167872 is 278761824766.

It is a super-2 number, since 2×667428167872² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1736038 + ... + 2085349.

It is an arithmetic number, because the mean of its divisors is an integer number (47318336910).

Almost surely, 2^667428167872 is an apocalyptic number.

It is an amenable number.

667428167872 is a deficient number, since it is larger than the sum of its proper divisors (657485265608).

667428167872 is a wasteful number, since it uses less digits than its factorization.

667428167872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3824128 (or 3824118 counting only the distinct ones).

The product of its digits is 75866112, while the sum is 64.

The spelling of 667428167872 in words is "six hundred sixty-seven billion, four hundred twenty-eight million, one hundred sixty-seven thousand, eight hundred seventy-two".