667139709402 has 16 divisors (see below), whose sum is σ = 1482532687680. Its totient is φ = 222379903116.

The previous prime is 667139709391. The next prime is 667139709419. The reversal of 667139709402 is 204907931766.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 12354439063 = 667139709402 / (6 + 6 + 7 + 1 + 3 + 9 + 7 + 0 + 9 + 4 + 0 + 2).

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, 6177219478 + ... + 6177219585.

It is an arithmetic number, because the mean of its divisors is an integer number (92658292980).

Almost surely, 2^667139709402 is an apocalyptic number.

667139709402 is an abundant number, since it is smaller than the sum of its proper divisors (815392978278).

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

667139709402 is a wasteful number, since it uses less digits than its factorization.

667139709402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12354439074 (or 12354439068 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 54.

The spelling of 667139709402 in words is "six hundred sixty-seven billion, one hundred thirty-nine million, seven hundred nine thousand, four hundred two".