644125157 has 8 divisors (see below), whose sum is σ = 702455040. Its totient is φ = 587049840.

The previous prime is 644125151. The next prime is 644125159. The reversal of 644125157 is 751521446.

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

It is not a de Polignac number, because 644125157 - 2⁶ = 644125093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644125151) 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, 312569 + ... + 314622.

It is an arithmetic number, because the mean of its divisors is an integer number (87806880).

Almost surely, 2^644125157 is an apocalyptic number.

It is an amenable number.

644125157 is a deficient number, since it is larger than the sum of its proper divisors (58329883).

644125157 is a wasteful number, since it uses less digits than its factorization.

644125157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627283.

The product of its digits is 33600, while the sum is 35.

The square root of 644125157 is about 25379.6208994540. The cubic root of 644125157 is about 863.6214499119.

The spelling of 644125157 in words is "six hundred forty-four million, one hundred twenty-five thousand, one hundred fifty-seven".