18038101636 has 9 divisors (see below), whose sum is σ = 31567147941. Its totient is φ = 9018916512.

The previous prime is 18038101633. The next prime is 18038101643. The reversal of 18038101636 is 63610183081.

The square root of 18038101636 is 134306.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4174452100 + 13863649536 = 64610^2 + 117744^2 .

It is a super-2 number, since 2×18038101636² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18038101595 and 18038101604.

It is not an unprimeable number, because it can be changed into a prime (18038101633) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 235036 + ... + 302188.

Almost surely, 2^18038101636 is an apocalyptic number.

18038101636 is the 134306-th square number.

It is an amenable number.

18038101636 is a deficient number, since it is larger than the sum of its proper divisors (13529046305).

18038101636 is an frugal number, since it uses more digits than its factorization.

18038101636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134310 (or 67155 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

Multiplying 18038101636 by its product of nonzero digits (20736), we get a square (374038075524096 = 19340064²).

The spelling of 18038101636 in words is "eighteen billion, thirty-eight million, one hundred one thousand, six hundred thirty-six".