660431425 has 12 divisors (see below), whose sum is σ = 827046396. Its totient is φ = 523112000.

The previous prime is 660431411. The next prime is 660431441. The reversal of 660431425 is 524134066.

It can be written as a sum of positive squares in 6 ways, for example, as 7935489 + 652495936 = 2817^2 + 25544^2 .

It is a de Polignac number, because none of the positive numbers 2^k-660431425 is a prime.

It is a Duffinian number.

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, 128254 + ... + 133303.

It is an arithmetic number, because the mean of its divisors is an integer number (68920533).

Almost surely, 2^660431425 is an apocalyptic number.

It is an amenable number.

660431425 is a deficient number, since it is larger than the sum of its proper divisors (166614971).

660431425 is a wasteful number, since it uses less digits than its factorization.

660431425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261668 (or 261663 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 660431425 is about 25698.8603832933. The cubic root of 660431425 is about 870.8484368668.

The spelling of 660431425 in words is "six hundred sixty million, four hundred thirty-one thousand, four hundred twenty-five".