252563211665 has 32 divisors (see below), whose sum is σ = 307712196000. Its totient is φ = 198985973760.

The previous prime is 252563211617. The next prime is 252563211671. The reversal of 252563211665 is 566112365252.

It can be written as a sum of positive squares in 16 ways, for example, as 53974440976 + 198588770689 = 232324^2 + 445633^2 .

It is not a de Polignac number, because 252563211665 - 2⁶ = 252563211601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68760269 + ... + 68763941.

It is an arithmetic number, because the mean of its divisors is an integer number (9616006125).

Almost surely, 2^252563211665 is an apocalyptic number.

It is an amenable number.

252563211665 is a deficient number, since it is larger than the sum of its proper divisors (55148984335).

252563211665 is a wasteful number, since it uses less digits than its factorization.

252563211665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4517.

The product of its digits is 648000, while the sum is 44.

The spelling of 252563211665 in words is "two hundred fifty-two billion, five hundred sixty-three million, two hundred eleven thousand, six hundred sixty-five".