253666445 has 4 divisors (see below), whose sum is σ = 304399740. Its totient is φ = 202933152.

The previous prime is 253666423. The next prime is 253666463. The reversal of 253666445 is 544666352.

It is a happy number.

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 121462441 + 132204004 = 11021^2 + 11498^2 .

It is a cyclic number.

It is not a de Polignac number, because 253666445 - 2¹⁰ = 253665421 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25366640 + ... + 25366649.

It is an arithmetic number, because the mean of its divisors is an integer number (76099935).

Almost surely, 2^253666445 is an apocalyptic number.

It is an amenable number.

253666445 is a deficient number, since it is larger than the sum of its proper divisors (50733295).

253666445 is an equidigital number, since it uses as much as digits as its factorization.

253666445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50733294.

The product of its digits is 518400, while the sum is 41.

The square root of 253666445 is about 15926.9094616627. The cubic root of 253666445 is about 633.0252122327.

The spelling of 253666445 in words is "two hundred fifty-three million, six hundred sixty-six thousand, four hundred forty-five".