18444442525 has 12 divisors (see below), whose sum is σ = 22882761972. Its totient is φ = 14748035840.

The previous prime is 18444442483. The next prime is 18444442591. The reversal of 18444442525 is 52524444481.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1367964196 + 17076478329 = 36986^2 + 130677^2 .

It is not a de Polignac number, because 18444442525 - 2⁷ = 18444442397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137644 + ... + 236293.

It is an arithmetic number, because the mean of its divisors is an integer number (1906896831).

Almost surely, 2^18444442525 is an apocalyptic number.

It is an amenable number.

18444442525 is a deficient number, since it is larger than the sum of its proper divisors (4438319447).

18444442525 is a wasteful number, since it uses less digits than its factorization.

18444442525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375920 (or 375915 counting only the distinct ones).

The product of its digits is 819200, while the sum is 43.

The spelling of 18444442525 in words is "eighteen billion, four hundred forty-four million, four hundred forty-two thousand, five hundred twenty-five".