18443252230961 has 2 divisors, whose sum is σ = 18443252230962. Its totient is φ = 18443252230960.

The previous prime is 18443252230957. The next prime is 18443252230987. The reversal of 18443252230961 is 16903225234481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18423246957361 + 20005273600 = 4292231^2 + 141440^2 .

It is a cyclic number.

It is not a de Polignac number, because 18443252230961 - 2² = 18443252230957 is a prime.

It is not a weakly prime, because it can be changed into another prime (18443252230061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9221626115480 + 9221626115481.

It is an arithmetic number, because the mean of its divisors is an integer number (9221626115481).

Almost surely, 2^{18443252230961} is an apocalyptic number.

It is an amenable number.

18443252230961 is a deficient number, since it is larger than the sum of its proper divisors (1).

18443252230961 is an equidigital number, since it uses as much as digits as its factorization.

18443252230961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 50.

The spelling of 18443252230961 in words is "eighteen trillion, four hundred forty-three billion, two hundred fifty-two million, two hundred thirty thousand, nine hundred sixty-one".