18454665473 has 2 divisors, whose sum is σ = 18454665474. Its totient is φ = 18454665472.

The previous prime is 18454665433. The next prime is 18454665497. The reversal of 18454665473 is 37456645481.

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., 18454407409 + 258064 = 135847^2 + 508^2 .

It is an emirp because it is prime and its reverse (37456645481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18454665473 - 2³⁰ = 17380923649 is a prime.

It is a super-4 number, since 4×18454665473⁴ (a number of 42 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (18454665433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9227332736 + 9227332737.

It is an arithmetic number, because the mean of its divisors is an integer number (9227332737).

Almost surely, 2^18454665473 is an apocalyptic number.

It is an amenable number.

18454665473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18454665473 is an equidigital number, since it uses as much as digits as its factorization.

18454665473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9676800, while the sum is 53.

The spelling of 18454665473 in words is "eighteen billion, four hundred fifty-four million, six hundred sixty-five thousand, four hundred seventy-three".