18879198137 has 2 divisors, whose sum is σ = 18879198138. Its totient is φ = 18879198136.

The previous prime is 18879198113. The next prime is 18879198161. The reversal of 18879198137 is 73189197881.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (18879198113) and next prime (18879198161).

It can be written as a sum of positive squares in only one way, i.e., 13645977856 + 5233220281 = 116816^2 + 72341^2 .

It is an emirp because it is prime and its reverse (73189197881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18879198137 - 2¹² = 18879194041 is a prime.

It is a super-2 number, since 2×18879198137² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18879198137.

It is not a weakly prime, because it can be changed into another prime (18879198187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9439599068 + 9439599069.

It is an arithmetic number, because the mean of its divisors is an integer number (9439599069).

Almost surely, 2^18879198137 is an apocalyptic number.

It is an amenable number.

18879198137 is a deficient number, since it is larger than the sum of its proper divisors (1).

18879198137 is an equidigital number, since it uses as much as digits as its factorization.

18879198137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 62.

The spelling of 18879198137 in words is "eighteen billion, eight hundred seventy-nine million, one hundred ninety-eight thousand, one hundred thirty-seven".