18135906493944 has 32 divisors (see below), whose sum is σ = 45340543059840. Its totient is φ = 6045198588000.

The previous prime is 18135906493921. The next prime is 18135906493951. The reversal of 18135906493944 is 44939460953181.

It is a super-2 number, since 2×18135906493944² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5037082 + ... + 7851369.

It is an arithmetic number, because the mean of its divisors is an integer number (1416891970620).

Almost surely, 2^{18135906493944} is an apocalyptic number.

It is an amenable number.

18135906493944 is an abundant number, since it is smaller than the sum of its proper divisors (27204636565896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18135906493944 is a wasteful number, since it uses less digits than its factorization.

18135906493944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12947091 (or 12947087 counting only the distinct ones).

The product of its (nonzero) digits is 100776960, while the sum is 66.

The spelling of 18135906493944 in words is "eighteen trillion, one hundred thirty-five billion, nine hundred six million, four hundred ninety-three thousand, nine hundred forty-four".