666725667 has 8 divisors (see below), whose sum is σ = 897276096. Its totient is φ = 440329512.

The previous prime is 666725663. The next prime is 666725693. The reversal of 666725667 is 766527666.

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

It is not a de Polignac number, because 666725667 - 2² = 666725663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666725663) 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, 1038193 + ... + 1038834.

It is an arithmetic number, because the mean of its divisors is an integer number (112159512).

Almost surely, 2^666725667 is an apocalyptic number.

666725667 is a deficient number, since it is larger than the sum of its proper divisors (230550429).

666725667 is a wasteful number, since it uses less digits than its factorization.

666725667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2077137.

The product of its digits is 3810240, while the sum is 51.

The square root of 666725667 is about 25821.0314859806. The cubic root of 666725667 is about 873.6062347454.

The spelling of 666725667 in words is "six hundred sixty-six million, seven hundred twenty-five thousand, six hundred sixty-seven".