666253802 has 4 divisors (see below), whose sum is σ = 999380706. Its totient is φ = 333126900.

The previous prime is 666253793. The next prime is 666253843. The reversal of 666253802 is 208352666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 208352666 = 2 ⋅104176333.

It can be written as a sum of positive squares in only one way, i.e., 554084521 + 112169281 = 23539^2 + 10591^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166563449 + ... + 166563452.

Almost surely, 2^666253802 is an apocalyptic number.

666253802 is a deficient number, since it is larger than the sum of its proper divisors (333126904).

666253802 is a wasteful number, since it uses less digits than its factorization.

666253802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333126903.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 666253802 is about 25811.8926466077. The cubic root of 666253802 is about 873.4000922428.

The spelling of 666253802 in words is "six hundred sixty-six million, two hundred fifty-three thousand, eight hundred two".