664402253 has 4 divisors (see below), whose sum is σ = 680607228. Its totient is φ = 648197280.

The previous prime is 664402247. The next prime is 664402327. The reversal of 664402253 is 352204466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 362407369 + 301994884 = 19037^2 + 17378^2 .

It is a cyclic number.

It is not a de Polignac number, because 664402253 - 2⁴ = 664402237 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 (664405253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8102426 + ... + 8102507.

It is an arithmetic number, because the mean of its divisors is an integer number (170151807).

Almost surely, 2^664402253 is an apocalyptic number.

It is an amenable number.

664402253 is a deficient number, since it is larger than the sum of its proper divisors (16204975).

664402253 is a wasteful number, since it uses less digits than its factorization.

664402253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16204974.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 664402253 is about 25776.0014936374. The cubic root of 664402253 is about 872.5902690106.

The spelling of 664402253 in words is "six hundred sixty-four million, four hundred two thousand, two hundred fifty-three".