18523126737 has 18 divisors (see below), whose sum is σ = 27783288338. Its totient is φ = 12348746784.

The previous prime is 18523126717. The next prime is 18523126753. The reversal of 18523126737 is 73762132581.

It can be written as a sum of positive squares in only one way, i.e., 18319893201 + 203233536 = 135351^2 + 14256^2 .

It is not a de Polignac number, because 18523126737 - 2¹² = 18523122641 is a prime.

It is a super-2 number, since 2×18523126737² (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 = 18523126692 and 18523126701.

It is not an unprimeable number, because it can be changed into a prime (18523126717) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1405048 + ... + 1418169.

Almost surely, 2^18523126737 is an apocalyptic number.

It is an amenable number.

18523126737 is a deficient number, since it is larger than the sum of its proper divisors (9260161601).

18523126737 is an frugal number, since it uses more digits than its factorization.

18523126737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2823241 (or 2823220 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The spelling of 18523126737 in words is "eighteen billion, five hundred twenty-three million, one hundred twenty-six thousand, seven hundred thirty-seven".