667659426 has 16 divisors (see below), whose sum is σ = 1526078784. Its totient is φ = 190759824.

The previous prime is 667659407. The next prime is 667659481. The reversal of 667659426 is 624956766.

It is a happy number.

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, 7948285 + ... + 7948368.

It is an arithmetic number, because the mean of its divisors is an integer number (95379924).

Almost surely, 2^667659426 is an apocalyptic number.

667659426 is an abundant number, since it is smaller than the sum of its proper divisors (858419358).

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

667659426 is a wasteful number, since it uses less digits than its factorization.

667659426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15896665.

The product of its digits is 3265920, while the sum is 51.

The square root of 667659426 is about 25839.1065248007. The cubic root of 667659426 is about 874.0138772502.

The spelling of 667659426 in words is "six hundred sixty-seven million, six hundred fifty-nine thousand, four hundred twenty-six".