18732918397 has 2 divisors, whose sum is σ = 18732918398. Its totient is φ = 18732918396.

The previous prime is 18732918319. The next prime is 18732918419. The reversal of 18732918397 is 79381923781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17565261156 + 1167657241 = 132534^2 + 34171^2 .

It is a cyclic number.

It is not a de Polignac number, because 18732918397 - 2²⁷ = 18598700669 is a prime.

It is a super-2 number, since 2×18732918397² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18732918797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9366459198 + 9366459199.

It is an arithmetic number, because the mean of its divisors is an integer number (9366459199).

Almost surely, 2^18732918397 is an apocalyptic number.

It is an amenable number.

18732918397 is a deficient number, since it is larger than the sum of its proper divisors (1).

18732918397 is an equidigital number, since it uses as much as digits as its factorization.

18732918397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 58.

The spelling of 18732918397 in words is "eighteen billion, seven hundred thirty-two million, nine hundred eighteen thousand, three hundred ninety-seven".