664161253 has 16 divisors (see below), whose sum is σ = 805037184. Its totient is φ = 534896640.

The previous prime is 664161241. The next prime is 664161293. The reversal of 664161253 is 352161466.

It is a cyclic number.

It is not a de Polignac number, because 664161253 - 2⁵ = 664161221 is a prime.

It is a super-2 number, since 2×664161253² = 882220339973060018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664161293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71926 + ... + 80632.

It is an arithmetic number, because the mean of its divisors is an integer number (50314824).

Almost surely, 2^664161253 is an apocalyptic number.

It is an amenable number.

664161253 is a deficient number, since it is larger than the sum of its proper divisors (140875931).

664161253 is a wasteful number, since it uses less digits than its factorization.

664161253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9372.

The product of its digits is 25920, while the sum is 34.

The square root of 664161253 is about 25771.3261785264. The cubic root of 664161253 is about 872.4847507618.

The spelling of 664161253 in words is "six hundred sixty-four million, one hundred sixty-one thousand, two hundred fifty-three".