18351611885418 has 32 divisors (see below), whose sum is σ = 42102476576640. Its totient is φ = 5223825791040.

The previous prime is 18351611885401. The next prime is 18351611885419. The reversal of 18351611885418 is 81458811615381.

It is a super-2 number, since 2×18351611885418² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18351611885419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 812150673 + ... + 812173268.

It is an arithmetic number, because the mean of its divisors is an integer number (1315702393020).

Almost surely, 2^{18351611885418} is an apocalyptic number.

18351611885418 is an abundant number, since it is smaller than the sum of its proper divisors (23750864691222).

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

18351611885418 is a wasteful number, since it uses less digits than its factorization.

18351611885418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624324222.

The product of its digits is 7372800, while the sum is 60.

The spelling of 18351611885418 in words is "eighteen trillion, three hundred fifty-one billion, six hundred eleven million, eight hundred eighty-five thousand, four hundred eighteen".