664116425 has 12 divisors (see below), whose sum is σ = 941148096. Its totient is φ = 455394000.

The previous prime is 664116413. The next prime is 664116451. The reversal of 664116425 is 524611466.

It is not a de Polignac number, because 664116425 - 2⁶ = 664116361 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1897301 + ... + 1897650.

It is an arithmetic number, because the mean of its divisors is an integer number (78429008).

Almost surely, 2^664116425 is an apocalyptic number.

It is an amenable number.

664116425 is a deficient number, since it is larger than the sum of its proper divisors (277031671).

664116425 is a wasteful number, since it uses less digits than its factorization.

664116425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3794968 (or 3794963 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 664116425 is about 25770.4564375566. The cubic root of 664116425 is about 872.4651206764.

The spelling of 664116425 in words is "six hundred sixty-four million, one hundred sixteen thousand, four hundred twenty-five".