666698530 has 16 divisors (see below), whose sum is σ = 1200878784. Its totient is φ = 266496880.

The previous prime is 666698519. The next prime is 666698533. The reversal of 666698530 is 35896666.

It is not an unprimeable number, because it can be changed into a prime (666698533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6952 + ... + 37171.

It is an arithmetic number, because the mean of its divisors is an integer number (75054924).

Almost surely, 2^666698530 is an apocalyptic number.

666698530 is a deficient number, since it is larger than the sum of its proper divisors (534180254).

666698530 is a wasteful number, since it uses less digits than its factorization.

666698530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45641.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The square root of 666698530 is about 25820.5059981403. The cubic root of 666698530 is about 873.5943821073.

The spelling of 666698530 in words is "six hundred sixty-six million, six hundred ninety-eight thousand, five hundred thirty".