18461670503791 has 2 divisors, whose sum is σ = 18461670503792. Its totient is φ = 18461670503790.

The previous prime is 18461670503789. The next prime is 18461670503897. The reversal of 18461670503791 is 19730507616481.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18461670503791 - 2¹ = 18461670503789 is a prime.

Together with 18461670503789, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18461670503491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9230835251895 + 9230835251896.

It is an arithmetic number, because the mean of its divisors is an integer number (9230835251896).

Almost surely, 2^{18461670503791} is an apocalyptic number.

18461670503791 is a deficient number, since it is larger than the sum of its proper divisors (1).

18461670503791 is an equidigital number, since it uses as much as digits as its factorization.

18461670503791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7620480, while the sum is 58.

The spelling of 18461670503791 in words is "eighteen trillion, four hundred sixty-one billion, six hundred seventy million, five hundred three thousand, seven hundred ninety-one".