18743801641 has 2 divisors, whose sum is σ = 18743801642. Its totient is φ = 18743801640.

The previous prime is 18743801563. The next prime is 18743801651. The reversal of 18743801641 is 14610834781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16877907225 + 1865894416 = 129915^2 + 43196^2 .

It is a cyclic number.

It is not a de Polignac number, because 18743801641 - 2⁷ = 18743801513 is a prime.

It is not a weakly prime, because it can be changed into another prime (18743801651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9371900820 + 9371900821.

It is an arithmetic number, because the mean of its divisors is an integer number (9371900821).

Almost surely, 2^18743801641 is an apocalyptic number.

It is an amenable number.

18743801641 is a deficient number, since it is larger than the sum of its proper divisors (1).

18743801641 is an equidigital number, since it uses as much as digits as its factorization.

18743801641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 43.

The spelling of 18743801641 in words is "eighteen billion, seven hundred forty-three million, eight hundred one thousand, six hundred forty-one".