666025915 has 8 divisors (see below), whose sum is σ = 846244800. Its totient is φ = 501478272.

The previous prime is 666025909. The next prime is 666025933. The reversal of 666025915 is 519520666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666025915 - 2⁵ = 666025883 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3917715 + ... + 3917884.

It is an arithmetic number, because the mean of its divisors is an integer number (105780600).

Almost surely, 2^666025915 is an apocalyptic number.

666025915 is a deficient number, since it is larger than the sum of its proper divisors (180218885).

666025915 is a wasteful number, since it uses less digits than its factorization.

666025915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7835621.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 666025915 is about 25807.4778891700. The cubic root of 666025915 is about 873.3005009541.

The spelling of 666025915 in words is "six hundred sixty-six million, twenty-five thousand, nine hundred fifteen".