18361138067538 has 16 divisors (see below), whose sum is σ = 41968315583040. Its totient is φ = 5246039447856.

The previous prime is 18361138067521. The next prime is 18361138067599. The reversal of 18361138067538 is 83576083116381.

It is a happy number.

It is a super-2 number, since 2×18361138067538² (a number of 27 digits) contains 22 as substring.

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, 218584976953 + ... + 218584977036.

It is an arithmetic number, because the mean of its divisors is an integer number (2623019723940).

Almost surely, 2^{18361138067538} is an apocalyptic number.

18361138067538 is an abundant number, since it is smaller than the sum of its proper divisors (23607177515502).

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

18361138067538 is a wasteful number, since it uses less digits than its factorization.

18361138067538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437169954001.

The product of its (nonzero) digits is 17418240, while the sum is 60.

The spelling of 18361138067538 in words is "eighteen trillion, three hundred sixty-one billion, one hundred thirty-eight million, sixty-seven thousand, five hundred thirty-eight".