252818661 has 4 divisors (see below), whose sum is σ = 337091552. Its totient is φ = 168545772.

The previous prime is 252818653. The next prime is 252818663. The reversal of 252818661 is 166818252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 252818661 - 2³ = 252818653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252818663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42136441 + ... + 42136446.

It is an arithmetic number, because the mean of its divisors is an integer number (84272888).

Almost surely, 2^252818661 is an apocalyptic number.

It is an amenable number.

252818661 is a deficient number, since it is larger than the sum of its proper divisors (84272891).

252818661 is an equidigital number, since it uses as much as digits as its factorization.

252818661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84272890.

The product of its digits is 46080, while the sum is 39.

The square root of 252818661 is about 15900.2723561579. The cubic root of 252818661 is about 632.3192094743.

The spelling of 252818661 in words is "two hundred fifty-two million, eight hundred eighteen thousand, six hundred sixty-one".