252661615 has 4 divisors (see below), whose sum is σ = 303193944. Its totient is φ = 202129288.

The previous prime is 252661571. The next prime is 252661631. The reversal of 252661615 is 516166252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 252661615 - 2¹⁵ = 252628847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25266157 + ... + 25266166.

It is an arithmetic number, because the mean of its divisors is an integer number (75798486).

Almost surely, 2^252661615 is an apocalyptic number.

252661615 is a deficient number, since it is larger than the sum of its proper divisors (50532329).

252661615 is an equidigital number, since it uses as much as digits as its factorization.

252661615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50532328.

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

The square root of 252661615 is about 15895.3331201331. Note that the first 3 decimals coincide. The cubic root of 252661615 is about 632.1882542526.

The spelling of 252661615 in words is "two hundred fifty-two million, six hundred sixty-one thousand, six hundred fifteen".