18558612937 has 2 divisors, whose sum is σ = 18558612938. Its totient is φ = 18558612936.

The previous prime is 18558612893. The next prime is 18558612953. The reversal of 18558612937 is 73921685581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11427823801 + 7130789136 = 106901^2 + 84444^2 .

It is a cyclic number.

It is not a de Polignac number, because 18558612937 - 2³¹ = 16411129289 is a prime.

It is a super-2 number, since 2×18558612937² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18558613937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9279306468 + 9279306469.

It is an arithmetic number, because the mean of its divisors is an integer number (9279306469).

Almost surely, 2^18558612937 is an apocalyptic number.

It is an amenable number.

18558612937 is a deficient number, since it is larger than the sum of its proper divisors (1).

18558612937 is an equidigital number, since it uses as much as digits as its factorization.

18558612937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3628800, while the sum is 55.

The spelling of 18558612937 in words is "eighteen billion, five hundred fifty-eight million, six hundred twelve thousand, nine hundred thirty-seven".