18172062138 has 16 divisors (see below), whose sum is σ = 36939930336. Its totient is φ = 5958053040.

The previous prime is 18172062133. The next prime is 18172062149. The reversal of 18172062138 is 83126027181.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18172062096 and 18172062105.

It is not an unprimeable number, because it can be changed into a prime (18172062131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24824856 + ... + 24825587.

It is an arithmetic number, because the mean of its divisors is an integer number (2308745646).

Almost surely, 2^18172062138 is an apocalyptic number.

18172062138 is an abundant number, since it is smaller than the sum of its proper divisors (18767868198).

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

18172062138 is a wasteful number, since it uses less digits than its factorization.

18172062138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49650509.

The product of its (nonzero) digits is 32256, while the sum is 39.

The spelling of 18172062138 in words is "eighteen billion, one hundred seventy-two million, sixty-two thousand, one hundred thirty-eight".