252655431661 has 4 divisors (see below), whose sum is σ = 252676896732. Its totient is φ = 252633966592.

The previous prime is 252655431619. The next prime is 252655431671. The reversal of 252655431661 is 166134556252.

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

It can be written as a sum of positive squares in 2 ways, for example, as 103929509161 + 148725922500 = 322381^2 + 385650^2 .

It is a cyclic number.

It is not a de Polignac number, because 252655431661 - 2²³ = 252647043053 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 (252655431671) 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, 10714870 + ... + 10738423.

It is an arithmetic number, because the mean of its divisors is an integer number (63169224183).

Almost surely, 2^252655431661 is an apocalyptic number.

It is an amenable number.

252655431661 is a deficient number, since it is larger than the sum of its proper divisors (21465071).

252655431661 is a wasteful number, since it uses less digits than its factorization.

252655431661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21465070.

The product of its digits is 1296000, while the sum is 46.

The spelling of 252655431661 in words is "two hundred fifty-two billion, six hundred fifty-five million, four hundred thirty-one thousand, six hundred sixty-one".