18917291963 has 2 divisors, whose sum is σ = 18917291964. Its totient is φ = 18917291962.

The previous prime is 18917291923. The next prime is 18917291969. The reversal of 18917291963 is 36919271981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18917291963 - 2⁸ = 18917291707 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18917291899 and 18917291908.

It is not a weakly prime, because it can be changed into another prime (18917291969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9458645981 + 9458645982.

It is an arithmetic number, because the mean of its divisors is an integer number (9458645982).

Almost surely, 2^18917291963 is an apocalyptic number.

18917291963 is a deficient number, since it is larger than the sum of its proper divisors (1).

18917291963 is an equidigital number, since it uses as much as digits as its factorization.

18917291963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 56.

The spelling of 18917291963 in words is "eighteen billion, nine hundred seventeen million, two hundred ninety-one thousand, nine hundred sixty-three".