18038157361801 has 4 divisors (see below), whose sum is σ = 18660162788100. Its totient is φ = 17416151935504.

The previous prime is 18038157361733. The next prime is 18038157361897. The reversal of 18038157361801 is 10816375183081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6360867349776 + 11677290012025 = 2522076^2 + 3417205^2 .

It is a cyclic number.

It is not a de Polignac number, because 18038157361801 - 2¹³ = 18038157353609 is a prime.

It is a super-2 number, since 2×18038157361801² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18038157361201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311002713106 + ... + 311002713163.

It is an arithmetic number, because the mean of its divisors is an integer number (4665040697025).

Almost surely, 2^{18038157361801} is an apocalyptic number.

It is an amenable number.

18038157361801 is a deficient number, since it is larger than the sum of its proper divisors (622005426299).

18038157361801 is an equidigital number, since it uses as much as digits as its factorization.

18038157361801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622005426298.

The product of its (nonzero) digits is 967680, while the sum is 52.

The spelling of 18038157361801 in words is "eighteen trillion, thirty-eight billion, one hundred fifty-seven million, three hundred sixty-one thousand, eight hundred one".