18139321970437 has 2 divisors, whose sum is σ = 18139321970438. Its totient is φ = 18139321970436.

The previous prime is 18139321970383. The next prime is 18139321970453. The reversal of 18139321970437 is 73407912393181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15652222651521 + 2487099318916 = 3956289^2 + 1577054^2 .

It is a cyclic number.

It is not a de Polignac number, because 18139321970437 - 2³⁹ = 17589566156549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18139321976437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9069660985218 + 9069660985219.

It is an arithmetic number, because the mean of its divisors is an integer number (9069660985219).

Almost surely, 2^{18139321970437} is an apocalyptic number.

It is an amenable number.

18139321970437 is a deficient number, since it is larger than the sum of its proper divisors (1).

18139321970437 is an equidigital number, since it uses as much as digits as its factorization.

18139321970437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6858432, while the sum is 58.

The spelling of 18139321970437 in words is "eighteen trillion, one hundred thirty-nine billion, three hundred twenty-one million, nine hundred seventy thousand, four hundred thirty-seven".