18954686473 has 2 divisors, whose sum is σ = 18954686474. Its totient is φ = 18954686472.

The previous prime is 18954686461. The next prime is 18954686477. The reversal of 18954686473 is 37468645981.

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., 10801860624 + 8152825849 = 103932^2 + 90293^2 .

It is a cyclic number.

It is not a de Polignac number, because 18954686473 - 2⁵ = 18954686441 is a prime.

It is not a weakly prime, because it can be changed into another prime (18954686477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9477343236 + 9477343237.

It is an arithmetic number, because the mean of its divisors is an integer number (9477343237).

Almost surely, 2^18954686473 is an apocalyptic number.

It is an amenable number.

18954686473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18954686473 is an equidigital number, since it uses as much as digits as its factorization.

18954686473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34836480, while the sum is 61.

The spelling of 18954686473 in words is "eighteen billion, nine hundred fifty-four million, six hundred eighty-six thousand, four hundred seventy-three".