18982501729 has 3 divisors (see below), whose sum is σ = 18982639507. Its totient is φ = 18982363952.

The previous prime is 18982501691. The next prime is 18982501739. The reversal of 18982501729 is 92710528981.

The square root of 18982501729 is 137777.

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 can be written as a sum of positive squares in only one way, i.e., 553896225 + 18428605504 = 23535^2 + 135752^2 .

It is not a de Polignac number, because 18982501729 - 2⁹ = 18982501217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18982501739) 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, 68889 + ... + 206665.

Almost surely, 2^18982501729 is an apocalyptic number.

18982501729 is the 137777-th square number.

18982501729 is the 68889-th centered octagonal number.

It is an amenable number.

18982501729 is a deficient number, since it is larger than the sum of its proper divisors (137778).

18982501729 is an frugal number, since it uses more digits than its factorization.

18982501729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275554 (or 137777 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 52.

The spelling of 18982501729 in words is "eighteen billion, nine hundred eighty-two million, five hundred one thousand, seven hundred twenty-nine".