253156565 has 8 divisors (see below), whose sum is σ = 304971480. Its totient is φ = 201736192.

The previous prime is 253156559. The next prime is 253156613. The reversal of 253156565 is 565651352.

It can be written as a sum of positive squares in 4 ways, for example, as 118178641 + 134977924 = 10871^2 + 11618^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 253156565 - 2⁴ = 253156549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97220 + ... + 99789.

It is an arithmetic number, because the mean of its divisors is an integer number (38121435).

Almost surely, 2^253156565 is an apocalyptic number.

It is an amenable number.

253156565 is a deficient number, since it is larger than the sum of its proper divisors (51814915).

253156565 is a wasteful number, since it uses less digits than its factorization.

253156565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197271.

The product of its digits is 135000, while the sum is 38.

The square root of 253156565 is about 15910.8945380202. The cubic root of 253156565 is about 632.6007921571.

The spelling of 253156565 in words is "two hundred fifty-three million, one hundred fifty-six thousand, five hundred sixty-five".