667420686875 has 20 divisors (see below), whose sum is σ = 844566027360. Its totient is φ = 527177820000.

The previous prime is 667420686839. The next prime is 667420686917. The reversal of 667420686875 is 578686024766.

It is not a de Polignac number, because 667420686875 - 2¹² = 667420682779 is a prime.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6709316 + ... + 6808065.

It is an arithmetic number, because the mean of its divisors is an integer number (42228301368).

Almost surely, 2^667420686875 is an apocalyptic number.

667420686875 is a deficient number, since it is larger than the sum of its proper divisors (177145340485).

667420686875 is an equidigital number, since it uses as much as digits as its factorization.

667420686875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13517480 (or 13517465 counting only the distinct ones).

The product of its (nonzero) digits is 162570240, while the sum is 65.

The spelling of 667420686875 in words is "six hundred sixty-seven billion, four hundred twenty million, six hundred eighty-six thousand, eight hundred seventy-five".