640125699 has 16 divisors (see below), whose sum is σ = 859541760. Its totient is φ = 423740960.

The previous prime is 640125623. The next prime is 640125709. The reversal of 640125699 is 996521046.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 640125699 - 2¹¹ = 640123651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640125699.

It is not an unprimeable number, because it can be changed into a prime (640124699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312922 + ... + 314960.

It is an arithmetic number, because the mean of its divisors is an integer number (53721360).

Almost surely, 2^640125699 is an apocalyptic number.

640125699 is a deficient number, since it is larger than the sum of its proper divisors (219416061).

640125699 is a wasteful number, since it uses less digits than its factorization.

640125699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2730.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 640125699 is about 25300.7055039973. The cubic root of 640125699 is about 861.8302911291.

The spelling of 640125699 in words is "six hundred forty million, one hundred twenty-five thousand, six hundred ninety-nine".