125664999 has 8 divisors (see below), whose sum is σ = 170054400. Its totient is φ = 82526136.

The previous prime is 125664997. The next prime is 125665019. The reversal of 125664999 is 999466521.

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

It is not a de Polignac number, because 125664999 - 2¹ = 125664997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125664991) 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, 312399 + ... + 312800.

It is an arithmetic number, because the mean of its divisors is an integer number (21256800).

Almost surely, 2^125664999 is an apocalyptic number.

125664999 is a deficient number, since it is larger than the sum of its proper divisors (44389401).

125664999 is an equidigital number, since it uses as much as digits as its factorization.

125664999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625269.

The product of its digits is 1049760, while the sum is 51.

The square root of 125664999 is about 11210.0400980550. The cubic root of 125664999 is about 500.8850976133.

The spelling of 125664999 in words is "one hundred twenty-five million, six hundred sixty-four thousand, nine hundred ninety-nine".