18275757661 has 4 divisors (see below), whose sum is σ = 20886580192. Its totient is φ = 15664935132.

The previous prime is 18275757659. The next prime is 18275757683. The reversal of 18275757661 is 16675757281.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16675757281 = 709 ⋅23520109.

It is not a de Polignac number, because 18275757661 - 2¹ = 18275757659 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 (18275757641) 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, 1305411255 + ... + 1305411268.

It is an arithmetic number, because the mean of its divisors is an integer number (5221645048).

Almost surely, 2^18275757661 is an apocalyptic number.

It is an amenable number.

18275757661 is a deficient number, since it is larger than the sum of its proper divisors (2610822531).

18275757661 is an equidigital number, since it uses as much as digits as its factorization.

18275757661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2610822530.

The product of its digits is 4939200, while the sum is 55.

The spelling of 18275757661 in words is "eighteen billion, two hundred seventy-five million, seven hundred fifty-seven thousand, six hundred sixty-one".