18282231661 has 6 divisors (see below), whose sum is σ = 19295098062. Its totient is φ = 17320008600.

The previous prime is 18282231659. The next prime is 18282231797. The reversal of 18282231661 is 16613228281.

It can be written as a sum of positive squares in only one way, i.e., 11325003561 + 6957228100 = 106419^2 + 83410^2 .

It is not a de Polignac number, because 18282231661 - 2¹ = 18282231659 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 (18282231631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25321290 + ... + 25322011.

It is an arithmetic number, because the mean of its divisors is an integer number (3215849677).

Almost surely, 2^18282231661 is an apocalyptic number.

It is an amenable number.

18282231661 is a deficient number, since it is larger than the sum of its proper divisors (1012866401).

18282231661 is an equidigital number, since it uses as much as digits as its factorization.

18282231661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50643339 (or 50643320 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The spelling of 18282231661 in words is "eighteen billion, two hundred eighty-two million, two hundred thirty-one thousand, six hundred sixty-one".