253640566 has 8 divisors (see below), whose sum is σ = 384735960. Its totient is φ = 125395248.

The previous prime is 253640507. The next prime is 253640579. The reversal of 253640566 is 665046352.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 712296 + ... + 712651.

It is an arithmetic number, because the mean of its divisors is an integer number (48091995).

Almost surely, 2^253640566 is an apocalyptic number.

253640566 is a deficient number, since it is larger than the sum of its proper divisors (131095394).

253640566 is a wasteful number, since it uses less digits than its factorization.

253640566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425038.

The product of its (nonzero) digits is 129600, while the sum is 37.

The square root of 253640566 is about 15926.0970108812. The cubic root of 253640566 is about 633.0036844654.

The spelling of 253640566 in words is "two hundred fifty-three million, six hundred forty thousand, five hundred sixty-six".