252561153561 has 4 divisors (see below), whose sum is σ = 336748204752. Its totient is φ = 168374102372.

The previous prime is 252561153541. The next prime is 252561153569. The reversal of 252561153561 is 165351165252.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 252561153561 - 2¹⁹ = 252560629273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (252561153569) 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, 42093525591 + ... + 42093525596.

It is an arithmetic number, because the mean of its divisors is an integer number (84187051188).

Almost surely, 2^252561153561 is an apocalyptic number.

It is an amenable number.

252561153561 is a deficient number, since it is larger than the sum of its proper divisors (84187051191).

252561153561 is an equidigital number, since it uses as much as digits as its factorization.

252561153561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84187051190.

The product of its digits is 270000, while the sum is 42.

The spelling of 252561153561 in words is "two hundred fifty-two billion, five hundred sixty-one million, one hundred fifty-three thousand, five hundred sixty-one".