668625123 has 6 divisors (see below), whose sum is σ = 891559884. Its totient is φ = 445720224.

The previous prime is 668625101. The next prime is 668625127. The reversal of 668625123 is 321526866.

It is not a de Polignac number, because 668625123 - 2⁵ = 668625091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668625127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37323 + ... + 52251.

It is an arithmetic number, because the mean of its divisors is an integer number (148593314).

Almost surely, 2^668625123 is an apocalyptic number.

668625123 is a deficient number, since it is larger than the sum of its proper divisors (222934761).

668625123 is an frugal number, since it uses more digits than its factorization.

668625123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29861 (or 14932 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The square root of 668625123 is about 25857.7865061958. The cubic root of 668625123 is about 874.4350630320.

The spelling of 668625123 in words is "six hundred sixty-eight million, six hundred twenty-five thousand, one hundred twenty-three".