18912575529 has 9 divisors (see below), whose sum is σ = 27318760599. Its totient is φ = 12608108640.

The previous prime is 18912575527. The next prime is 18912575537. The reversal of 18912575529 is 92557521981.

The square root of 18912575529 is 137523.

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

18912575529 is a `hidden beast` number, since 1 + 8 + 9 + 12 + 575 + 52 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12582781929 + 6329793600 = 112173^2 + 79560^2 .

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

It is not a de Polignac number, because 18912575529 - 2¹ = 18912575527 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18912575527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 389649 + ... + 435489.

Almost surely, 2^18912575529 is an apocalyptic number.

18912575529 is the 137523-rd square number.

18912575529 is the 68762-nd centered octagonal number.

It is an amenable number.

18912575529 is a deficient number, since it is larger than the sum of its proper divisors (8406185070).

18912575529 is an frugal number, since it uses more digits than its factorization.

18912575529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91688 (or 45844 counting only the distinct ones).

The product of its digits is 2268000, while the sum is 54.

It can be divided in two parts, 18912 and 575529, that added together give a square (594441 = 771²).

The spelling of 18912575529 in words is "eighteen billion, nine hundred twelve million, five hundred seventy-five thousand, five hundred twenty-nine".