666681475 has 12 divisors (see below), whose sum is σ = 827809120. Its totient is φ = 532620000.

The previous prime is 666681439. The next prime is 666681523. The reversal of 666681475 is 574186666.

It is not a de Polignac number, because 666681475 - 2²⁷ = 532463747 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1021 + ... + 36529.

Almost surely, 2^666681475 is an apocalyptic number.

666681475 is a deficient number, since it is larger than the sum of its proper divisors (161127645).

666681475 is a wasteful number, since it uses less digits than its factorization.

666681475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36270 (or 36265 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 49.

The square root of 666681475 is about 25820.1757352656. The cubic root of 666681475 is about 873.5869328238.

The spelling of 666681475 in words is "six hundred sixty-six million, six hundred eighty-one thousand, four hundred seventy-five".