18694272529 has 3 divisors (see below), whose sum is σ = 18694409257. Its totient is φ = 18694135802.

The previous prime is 18694272469. The next prime is 18694272551. The reversal of 18694272529 is 92527249681.

It is a happy number.

The square root of 18694272529 is 136727.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 18694272529 - 2²¹ = 18692175377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18694272529.

It is not an unprimeable number, because it can be changed into a prime (18694279529) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 68364 + ... + 205090.

Almost surely, 2^18694272529 is an apocalyptic number.

18694272529 is the 136727-th square number.

18694272529 is the 68364-th centered octagonal number.

It is an amenable number.

18694272529 is a deficient number, since it is larger than the sum of its proper divisors (136728).

18694272529 is an frugal number, since it uses more digits than its factorization.

18694272529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273454 (or 136727 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 55.

The spelling of 18694272529 in words is "eighteen billion, six hundred ninety-four million, two hundred seventy-two thousand, five hundred twenty-nine".