252640696565 has 8 divisors (see below), whose sum is σ = 321002296920. Its totient is φ = 190223583232.

The previous prime is 252640696547. The next prime is 252640696571. The reversal of 252640696565 is 565696046252.

It can be written as a sum of positive squares in 4 ways, for example, as 6043041169 + 246597655396 = 77737^2 + 496586^2 .

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 252640696565 - 2⁸ = 252640696309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 252640696565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1486121660 + ... + 1486121829.

It is an arithmetic number, because the mean of its divisors is an integer number (40125287115).

Almost surely, 2^252640696565 is an apocalyptic number.

It is an amenable number.

252640696565 is a deficient number, since it is larger than the sum of its proper divisors (68361600355).

252640696565 is a wasteful number, since it uses less digits than its factorization.

252640696565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2972243511.

The product of its (nonzero) digits is 23328000, while the sum is 56.

The spelling of 252640696565 in words is "two hundred fifty-two billion, six hundred forty million, six hundred ninety-six thousand, five hundred sixty-five".