18236936629 has 4 divisors (see below), whose sum is σ = 18417500460. Its totient is φ = 18056372800.

The previous prime is 18236936617. The next prime is 18236936633. The reversal of 18236936629 is 92663963281.

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 9883342225 + 8353594404 = 99415^2 + 91398^2 .

It is a cyclic number.

It is not a de Polignac number, because 18236936629 - 2¹¹ = 18236934581 is a prime.

It is a super-2 number, since 2×18236936629² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18236936629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18236934629) 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, 90281764 + ... + 90281965.

It is an arithmetic number, because the mean of its divisors is an integer number (4604375115).

Almost surely, 2^18236936629 is an apocalyptic number.

It is an amenable number.

18236936629 is a deficient number, since it is larger than the sum of its proper divisors (180563831).

18236936629 is a wasteful number, since it uses less digits than its factorization.

18236936629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180563830.

The product of its digits is 5038848, while the sum is 55.

The spelling of 18236936629 in words is "eighteen billion, two hundred thirty-six million, nine hundred thirty-six thousand, six hundred twenty-nine".