252102809857 has 4 divisors (see below), whose sum is σ = 252108661680. Its totient is φ = 252096958036.

The previous prime is 252102809851. The next prime is 252102809863. The reversal of 252102809857 is 758908201252.

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 an interprime number because it is at equal distance from previous prime (252102809851) and next prime (252102809863).

It is a cyclic number.

It is not a de Polignac number, because 252102809857 - 2¹⁵ = 252102777089 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 252102809857.

It is not an unprimeable number, because it can be changed into a prime (252102809851) 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, 2860807 + ... + 2947612.

It is an arithmetic number, because the mean of its divisors is an integer number (63027165420).

Almost surely, 2^252102809857 is an apocalyptic number.

It is an amenable number.

252102809857 is a deficient number, since it is larger than the sum of its proper divisors (5851823).

252102809857 is an equidigital number, since it uses as much as digits as its factorization.

252102809857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5851822.

The product of its (nonzero) digits is 806400, while the sum is 49.

The spelling of 252102809857 in words is "two hundred fifty-two billion, one hundred two million, eight hundred nine thousand, eight hundred fifty-seven".