666625123 has 8 divisors (see below), whose sum is σ = 705139488. Its totient is φ = 628905024.

The previous prime is 666625121. The next prime is 666625313. The reversal of 666625123 is 321526666.

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 666625123 - 2¹ = 666625121 is a prime.

It is a super-2 number, since 2×666625123² = 888778109229530258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666625121) 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, 196840 + ... + 200197.

It is an arithmetic number, because the mean of its divisors is an integer number (88142436).

Almost surely, 2^666625123 is an apocalyptic number.

666625123 is a deficient number, since it is larger than the sum of its proper divisors (38514365).

666625123 is a wasteful number, since it uses less digits than its factorization.

666625123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397133.

The product of its digits is 77760, while the sum is 37.

The square root of 666625123 is about 25819.0844725370. The cubic root of 666625123 is about 873.5623184915.

The spelling of 666625123 in words is "six hundred sixty-six million, six hundred twenty-five thousand, one hundred twenty-three".