18420322773631 has 2 divisors, whose sum is σ = 18420322773632. Its totient is φ = 18420322773630.

The previous prime is 18420322773623. The next prime is 18420322773637. The reversal of 18420322773631 is 13637722302481.

It is a strong prime.

It is an emirp because it is prime and its reverse (13637722302481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18420322773631 - 2³ = 18420322773623 is a prime.

It is a super-2 number, since 2×18420322773631² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18420322773637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9210161386815 + 9210161386816.

It is an arithmetic number, because the mean of its divisors is an integer number (9210161386816).

Almost surely, 2^{18420322773631} is an apocalyptic number.

18420322773631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18420322773631 is an equidigital number, since it uses as much as digits as its factorization.

18420322773631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 49.

The spelling of 18420322773631 in words is "eighteen trillion, four hundred twenty billion, three hundred twenty-two million, seven hundred seventy-three thousand, six hundred thirty-one".