18915279941 has 2 divisors, whose sum is σ = 18915279942. Its totient is φ = 18915279940.

The previous prime is 18915279923. The next prime is 18915279953. The reversal of 18915279941 is 14997251981.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15378480100 + 3536799841 = 124010^2 + 59471^2 .

It is a cyclic number.

It is not a de Polignac number, because 18915279941 - 2¹⁰ = 18915278917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18915269941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9457639970 + 9457639971.

It is an arithmetic number, because the mean of its divisors is an integer number (9457639971).

Almost surely, 2^18915279941 is an apocalyptic number.

It is an amenable number.

18915279941 is a deficient number, since it is larger than the sum of its proper divisors (1).

18915279941 is an equidigital number, since it uses as much as digits as its factorization.

18915279941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 56.

The spelling of 18915279941 in words is "eighteen billion, nine hundred fifteen million, two hundred seventy-nine thousand, nine hundred forty-one".