18120659769 has 15 divisors (see below), whose sum is σ = 27070943647. Its totient is φ = 12079632168.

The previous prime is 18120659749. The next prime is 18120659783. The reversal of 18120659769 is 96795602181.

The square root of 18120659769 is 134613.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4574493225 + 13546166544 = 67635^2 + 116388^2 .

It is not a de Polignac number, because 18120659769 - 2¹¹ = 18120657721 is a prime.

It is a super-2 number, since 2×18120659769² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18120659749) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1204039 + ... + 1218995.

Almost surely, 2^18120659769 is an apocalyptic number.

18120659769 is the 134613-rd square number.

18120659769 is the 67307-th centered octagonal number.

It is an amenable number.

18120659769 is a deficient number, since it is larger than the sum of its proper divisors (8950283878).

18120659769 is an frugal number, since it uses more digits than its factorization.

18120659769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29926 (or 14960 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 18120659769 in words is "eighteen billion, one hundred twenty million, six hundred fifty-nine thousand, seven hundred sixty-nine".