18061538836 has 72 divisors (see below), whose sum is σ = 36075281760. Its totient is φ = 7896947520.

The previous prime is 18061538827. The next prime is 18061538839. The reversal of 18061538836 is 63883516081.

It is a self number, because there is not a number n which added to its sum of digits gives 18061538836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18061538839) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3969915 + ... + 3974461.

It is an arithmetic number, because the mean of its divisors is an integer number (501045580).

Almost surely, 2^18061538836 is an apocalyptic number.

It is an amenable number.

18061538836 is a deficient number, since it is larger than the sum of its proper divisors (18013742924).

18061538836 is a wasteful number, since it uses less digits than its factorization.

18061538836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4885 (or 4872 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 18061538836 in words is "eighteen billion, sixty-one million, five hundred thirty-eight thousand, eight hundred thirty-six".