18742979237 has 2 divisors, whose sum is σ = 18742979238. Its totient is φ = 18742979236.

The previous prime is 18742979231. The next prime is 18742979251. The reversal of 18742979237 is 73297924781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15583527556 + 3159451681 = 124834^2 + 56209^2 .

It is a cyclic number.

It is not a de Polignac number, because 18742979237 - 2⁸ = 18742978981 is a prime.

It is a super-2 number, since 2×18742979237² (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 (18742979231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9371489618 + 9371489619.

It is an arithmetic number, because the mean of its divisors is an integer number (9371489619).

Almost surely, 2^18742979237 is an apocalyptic number.

It is an amenable number.

18742979237 is a deficient number, since it is larger than the sum of its proper divisors (1).

18742979237 is an equidigital number, since it uses as much as digits as its factorization.

18742979237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10668672, while the sum is 59.

The spelling of 18742979237 in words is "eighteen billion, seven hundred forty-two million, nine hundred seventy-nine thousand, two hundred thirty-seven".