666652658 has 32 divisors (see below), whose sum is σ = 1206042240. Its totient is φ = 269982720.

The previous prime is 666652633. The next prime is 666652681. The reversal of 666652658 is 856256666.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109010 + ... + 114962.

It is an arithmetic number, because the mean of its divisors is an integer number (37688820).

Almost surely, 2^666652658 is an apocalyptic number.

666652658 is a deficient number, since it is larger than the sum of its proper divisors (539389582).

666652658 is a wasteful number, since it uses less digits than its factorization.

666652658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6402.

The product of its digits is 3110400, while the sum is 50.

The square root of 666652658 is about 25819.6176966275. The cubic root of 666652658 is about 873.5743458447.

The spelling of 666652658 in words is "six hundred sixty-six million, six hundred fifty-two thousand, six hundred fifty-eight".