252636662221257 has 4 divisors (see below), whose sum is σ = 336848882961680. Its totient is φ = 168424441480836.

The previous prime is 252636662221247. The next prime is 252636662221261. The reversal of 252636662221257 is 752122266636252.

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 252636662221257 - 2⁴ = 252636662221241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 252636662221197 and 252636662221206.

It is not an unprimeable number, because it can be changed into a prime (252636662221247) 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, 42106110370207 + ... + 42106110370212.

It is an arithmetic number, because the mean of its divisors is an integer number (84212220740420).

Almost surely, 2^{252636662221257} is an apocalyptic number.

It is an amenable number.

252636662221257 is a deficient number, since it is larger than the sum of its proper divisors (84212220740423).

252636662221257 is an equidigital number, since it uses as much as digits as its factorization.

252636662221257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84212220740422.

The product of its digits is 43545600, while the sum is 57.

The spelling of 252636662221257 in words is "two hundred fifty-two trillion, six hundred thirty-six billion, six hundred sixty-two million, two hundred twenty-one thousand, two hundred fifty-seven".