18326779725 has 24 divisors (see below), whose sum is σ = 30665349792. Its totient is φ = 9656516800.

The previous prime is 18326779703. The next prime is 18326779729. The reversal of 18326779725 is 52797762381.

It is not a de Polignac number, because 18326779725 - 2⁵ = 18326779693 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18326779729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1465806 + ... + 1478255.

It is an arithmetic number, because the mean of its divisors is an integer number (1277722908).

Almost surely, 2^18326779725 is an apocalyptic number.

18326779725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18326779725 is a deficient number, since it is larger than the sum of its proper divisors (12338570067).

18326779725 is a wasteful number, since it uses less digits than its factorization.

18326779725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2944157 (or 2944152 counting only the distinct ones).

The product of its digits is 8890560, while the sum is 57.

The spelling of 18326779725 in words is "eighteen billion, three hundred twenty-six million, seven hundred seventy-nine thousand, seven hundred twenty-five".