18126253237 has 4 divisors (see below), whose sum is σ = 18129974796. Its totient is φ = 18122531680.

The previous prime is 18126253199. The next prime is 18126253253. The reversal of 18126253237 is 73235262181.

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 2139432516 + 15986820721 = 46254^2 + 126439^2 .

It is a cyclic number.

It is not a de Polignac number, because 18126253237 - 2⁷ = 18126253109 is a prime.

It is a super-2 number, since 2×18126253237² (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 18126253237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18126253267) 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, 1853464 + ... + 1863217.

It is an arithmetic number, because the mean of its divisors is an integer number (4532493699).

Almost surely, 2^18126253237 is an apocalyptic number.

It is an amenable number.

18126253237 is a deficient number, since it is larger than the sum of its proper divisors (3721559).

18126253237 is an equidigital number, since it uses as much as digits as its factorization.

18126253237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3721558.

The product of its digits is 120960, while the sum is 40.

The spelling of 18126253237 in words is "eighteen billion, one hundred twenty-six million, two hundred fifty-three thousand, two hundred thirty-seven".