18105958957631 has 2 divisors, whose sum is σ = 18105958957632. Its totient is φ = 18105958957630.

The previous prime is 18105958957621. The next prime is 18105958957637. The reversal of 18105958957631 is 13675985950181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18105958957631 - 2²² = 18105954763327 is a prime.

It is a super-2 number, since 2×18105958957631² (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 (18105958957637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9052979478815 + 9052979478816.

It is an arithmetic number, because the mean of its divisors is an integer number (9052979478816).

Almost surely, 2^{18105958957631} is an apocalyptic number.

18105958957631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18105958957631 is an equidigital number, since it uses as much as digits as its factorization.

18105958957631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648000, while the sum is 68.

The spelling of 18105958957631 in words is "eighteen trillion, one hundred five billion, nine hundred fifty-eight million, nine hundred fifty-seven thousand, six hundred thirty-one".