18455744737 has 2 divisors, whose sum is σ = 18455744738. Its totient is φ = 18455744736.

The previous prime is 18455744689. The next prime is 18455744743. The reversal of 18455744737 is 73744755481.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13420990801 + 5034753936 = 115849^2 + 70956^2 .

It is a cyclic number.

It is not a de Polignac number, because 18455744737 - 2²³ = 18447356129 is a prime.

It is a super-2 number, since 2×18455744737² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18455744137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9227872368 + 9227872369.

It is an arithmetic number, because the mean of its divisors is an integer number (9227872369).

Almost surely, 2^18455744737 is an apocalyptic number.

It is an amenable number.

18455744737 is a deficient number, since it is larger than the sum of its proper divisors (1).

18455744737 is an equidigital number, since it uses as much as digits as its factorization.

18455744737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13171200, while the sum is 55.

The spelling of 18455744737 in words is "eighteen billion, four hundred fifty-five million, seven hundred forty-four thousand, seven hundred thirty-seven".