253666557 has 12 divisors (see below), whose sum is σ = 366656160. Its totient is φ = 168996168.

The previous prime is 253666541. The next prime is 253666559. The reversal of 253666557 is 755666352.

It is not a de Polignac number, because 253666557 - 2⁴ = 253666541 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253666559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5694 + ... + 23232.

It is an arithmetic number, because the mean of its divisors is an integer number (30554680).

Almost surely, 2^253666557 is an apocalyptic number.

It is an amenable number.

253666557 is a deficient number, since it is larger than the sum of its proper divisors (112989603).

253666557 is a wasteful number, since it uses less digits than its factorization.

253666557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19152 (or 19149 counting only the distinct ones).

The product of its digits is 1134000, while the sum is 45.

The square root of 253666557 is about 15926.9129777242. The cubic root of 253666557 is about 633.0253053981.

The spelling of 253666557 in words is "two hundred fifty-three million, six hundred sixty-six thousand, five hundred fifty-seven".