253641645 has 16 divisors (see below), whose sum is σ = 450918720. Its totient is φ = 135275472.

The previous prime is 253641629. The next prime is 253641653. The reversal of 253641645 is 546146352.

253641645 is a `hidden beast` number, since 2 + 5 + 3 + 6 + 4 + 1 + 645 = 666.

It is not a de Polignac number, because 253641645 - 2⁴ = 253641629 is a prime.

It is a super-3 number, since 3×253641645³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 939279 + ... + 939548.

It is an arithmetic number, because the mean of its divisors is an integer number (28182420).

Almost surely, 2^253641645 is an apocalyptic number.

It is an amenable number.

253641645 is a deficient number, since it is larger than the sum of its proper divisors (197277075).

253641645 is a wasteful number, since it uses less digits than its factorization.

253641645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878841 (or 1878835 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 253641645 is about 15926.1308860627. The cubic root of 253641645 is about 633.0045820742.

Adding to 253641645 its reverse (546146352), we get a palindrome (799787997).

The spelling of 253641645 in words is "two hundred fifty-three million, six hundred forty-one thousand, six hundred forty-five".