253256666 has 12 divisors (see below), whose sum is σ = 409238046. Its totient is φ = 116850240.

The previous prime is 253256651. The next prime is 253256671. The reversal of 253256666 is 666652352.

It can be written as a sum of positive squares in 3 ways, for example, as 12355225 + 240901441 = 3515^2 + 15521^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79586 + ... + 82706.

Almost surely, 2^253256666 is an apocalyptic number.

253256666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

253256666 is a deficient number, since it is larger than the sum of its proper divisors (155981380).

253256666 is an frugal number, since it uses more digits than its factorization.

253256666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6257 (or 3136 counting only the distinct ones).

The product of its digits is 388800, while the sum is 41.

The square root of 253256666 is about 15914.0399019231. The cubic root of 253256666 is about 632.6841603649.

The spelling of 253256666 in words is "two hundred fifty-three million, two hundred fifty-six thousand, six hundred sixty-six".