18351052135506 has 48 divisors (see below), whose sum is σ = 41044777562880. Its totient is φ = 5919468634080.

The previous prime is 18351052135501. The next prime is 18351052135531. The reversal of 18351052135506 is 60553125015381.

18351052135506 is a `hidden beast` number, since 1 + 8 + 3 + 5 + 1 + 0 + 5 + 2 + 135 + 506 = 666.

It is a super-2 number, since 2×18351052135506² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18351052135501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14348385 + ... + 15574923.

It is an arithmetic number, because the mean of its divisors is an integer number (855099532560).

Almost surely, 2^{18351052135506} is an apocalyptic number.

18351052135506 is an abundant number, since it is smaller than the sum of its proper divisors (22693725427374).

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

18351052135506 is a wasteful number, since it uses less digits than its factorization.

18351052135506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253391 (or 1253388 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 45.

The spelling of 18351052135506 in words is "eighteen trillion, three hundred fifty-one billion, fifty-two million, one hundred thirty-five thousand, five hundred six".