18518519537037 has 24 divisors (see below), whose sum is σ = 28806800699768. Its totient is φ = 11395927065600.

The previous prime is 18518519536973. The next prime is 18518519537047. The reversal of 18518519537037 is 73073591581581.

18518519537037 is a `hidden beast` number, since 1 + 8 + 5 + 1 + 85 + 19 + 537 + 0 + 3 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1996416398916 + 16522103138121 = 1412946^2 + 4064739^2 .

It is not a de Polignac number, because 18518519537037 - 2⁶ = 18518519536973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18518519537047) 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, 17542737 + ... + 18568377.

Almost surely, 2^{18518519537037} is an apocalyptic number.

It is an amenable number.

18518519537037 is a deficient number, since it is larger than the sum of its proper divisors (10288281162731).

18518519537037 is a wasteful number, since it uses less digits than its factorization.

18518519537037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179981 (or 1179978 counting only the distinct ones).

The product of its (nonzero) digits is 31752000, while the sum is 63.

The spelling of 18518519537037 in words is "eighteen trillion, five hundred eighteen billion, five hundred nineteen million, five hundred thirty-seven thousand, thirty-seven".