18106177621 has 12 divisors (see below), whose sum is σ = 21144257388. Its totient is φ = 15459182592.

The previous prime is 18106177613. The next prime is 18106177643. The reversal of 18106177621 is 12677160181.

It can be written as a sum of positive squares in 2 ways, for example, as 18006956100 + 99221521 = 134190^2 + 9961^2 .

It is not a de Polignac number, because 18106177621 - 2³ = 18106177613 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 (18106177651) 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 11 ways as a sum of consecutive naturals, for example, 706306 + ... + 731491.

It is an arithmetic number, because the mean of its divisors is an integer number (1762021449).

Almost surely, 2^18106177621 is an apocalyptic number.

It is an amenable number.

18106177621 is a deficient number, since it is larger than the sum of its proper divisors (3038079767).

18106177621 is a wasteful number, since it uses less digits than its factorization.

18106177621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438068 (or 1438061 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 40.

The spelling of 18106177621 in words is "eighteen billion, one hundred six million, one hundred seventy-seven thousand, six hundred twenty-one".