666270898 has 4 divisors (see below), whose sum is σ = 999406350. Its totient is φ = 333135448.

The previous prime is 666270889. The next prime is 666270901. The reversal of 666270898 is 898072666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 543216249 + 123054649 = 23307^2 + 11093^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166567723 + ... + 166567726.

Almost surely, 2^666270898 is an apocalyptic number.

666270898 is a deficient number, since it is larger than the sum of its proper divisors (333135452).

666270898 is a wasteful number, since it uses less digits than its factorization.

666270898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333135451.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The square root of 666270898 is about 25812.2238096604. The cubic root of 666270898 is about 873.4075626293.

The spelling of 666270898 in words is "six hundred sixty-six million, two hundred seventy thousand, eight hundred ninety-eight".