663925401 has 24 divisors (see below), whose sum is σ = 974762880. Its totient is φ = 435386016.

The previous prime is 663925399. The next prime is 663925411. The reversal of 663925401 is 104529366.

It is a happy number.

663925401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 663925401 - 2¹ = 663925399 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (663925411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 206730 + ... + 209916.

It is an arithmetic number, because the mean of its divisors is an integer number (40615120).

Almost surely, 2^663925401 is an apocalyptic number.

It is an amenable number.

663925401 is a deficient number, since it is larger than the sum of its proper divisors (310837479).

663925401 is a wasteful number, since it uses less digits than its factorization.

663925401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3565 (or 3562 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 663925401 is about 25766.7499114654. The cubic root of 663925401 is about 872.3814617712.

The spelling of 663925401 in words is "six hundred sixty-three million, nine hundred twenty-five thousand, four hundred one".