666562642 has 8 divisors (see below), whose sum is σ = 999985536. Its totient is φ = 333234132.

The previous prime is 666562627. The next prime is 666562661. The reversal of 666562642 is 246265666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1978 + ... + 36565.

It is an arithmetic number, because the mean of its divisors is an integer number (124998192).

Almost surely, 2^666562642 is an apocalyptic number.

666562642 is a deficient number, since it is larger than the sum of its proper divisors (333422894).

666562642 is a wasteful number, since it uses less digits than its factorization.

666562642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47192.

The product of its digits is 622080, while the sum is 43.

The square root of 666562642 is about 25817.8744671206. The cubic root of 666562642 is about 873.5350254145.

The spelling of 666562642 in words is "six hundred sixty-six million, five hundred sixty-two thousand, six hundred forty-two".