257632017661 has 4 divisors (see below), whose sum is σ = 257706330912. Its totient is φ = 257557704412.

The previous prime is 257632017659. The next prime is 257632017683. The reversal of 257632017661 is 166710236752.

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 257632017661 - 2¹ = 257632017659 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 (257632017641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37151425 + ... + 37158358.

It is an arithmetic number, because the mean of its divisors is an integer number (64426582728).

Almost surely, 2^257632017661 is an apocalyptic number.

It is an amenable number.

257632017661 is a deficient number, since it is larger than the sum of its proper divisors (74313251).

257632017661 is an equidigital number, since it uses as much as digits as its factorization.

257632017661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74313250.

The product of its (nonzero) digits is 635040, while the sum is 46.

The spelling of 257632017661 in words is "two hundred fifty-seven billion, six hundred thirty-two million, seventeen thousand, six hundred sixty-one".