252156661 has 4 divisors (see below), whose sum is σ = 252197152. Its totient is φ = 252116172.

The previous prime is 252156649. The next prime is 252156691. The reversal of 252156661 is 166651252.

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 252156661 - 2⁵ = 252156629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252156691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8715 + ... + 24088.

It is an arithmetic number, because the mean of its divisors is an integer number (63049288).

Almost surely, 2^252156661 is an apocalyptic number.

It is an amenable number.

252156661 is a deficient number, since it is larger than the sum of its proper divisors (40491).

252156661 is an equidigital number, since it uses as much as digits as its factorization.

252156661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40490.

The product of its digits is 21600, while the sum is 34.

The square root of 252156661 is about 15879.4414574317. The cubic root of 252156661 is about 631.7668224943.

The spelling of 252156661 in words is "two hundred fifty-two million, one hundred fifty-six thousand, six hundred sixty-one".