252787661 has 8 divisors (see below), whose sum is σ = 289186560. Its totient is φ = 216460368.

The previous prime is 252787657. The next prime is 252787697. The reversal of 252787661 is 166787252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 252787661 - 2² = 252787657 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 (252787651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10106 + ... + 24651.

It is an arithmetic number, because the mean of its divisors is an integer number (36148320).

Almost surely, 2^252787661 is an apocalyptic number.

It is an amenable number.

252787661 is a deficient number, since it is larger than the sum of its proper divisors (36398899).

252787661 is a wasteful number, since it uses less digits than its factorization.

252787661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35803.

The product of its digits is 282240, while the sum is 44.

The square root of 252787661 is about 15899.2975002042. The cubic root of 252787661 is about 632.2933639444.

The spelling of 252787661 in words is "two hundred fifty-two million, seven hundred eighty-seven thousand, six hundred sixty-one".