18151364529 has 9 divisors (see below), whose sum is σ = 26219221483. Its totient is φ = 12100640232.

The previous prime is 18151364521. The next prime is 18151364531. The reversal of 18151364529 is 92546315181.

It is a happy number.

The square root of 18151364529 is 134727.

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

18151364529 is a `hidden beast` number, since 1 + 81 + 513 + 6 + 4 + 52 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3066612129 + 15084752400 = 55377^2 + 122820^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 18151364529 - 2³ = 18151364521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18151364521) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 381727 + ... + 426635.

Almost surely, 2^18151364529 is an apocalyptic number.

18151364529 is the 134727-th square number.

18151364529 is the 67364-th centered octagonal number.

It is an amenable number.

18151364529 is a deficient number, since it is larger than the sum of its proper divisors (8067856954).

18151364529 is an frugal number, since it uses more digits than its factorization.

18151364529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89824 (or 44912 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The spelling of 18151364529 in words is "eighteen billion, one hundred fifty-one million, three hundred sixty-four thousand, five hundred twenty-nine".