18773310481 has 2 divisors, whose sum is σ = 18773310482. Its totient is φ = 18773310480.

The previous prime is 18773310473. The next prime is 18773310547. The reversal of 18773310481 is 18401337781.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11500632081 + 7272678400 = 107241^2 + 85280^2 .

It is a cyclic number.

It is not a de Polignac number, because 18773310481 - 2³ = 18773310473 is a prime.

It is a super-2 number, since 2×18773310481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18773310581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9386655240 + 9386655241.

It is an arithmetic number, because the mean of its divisors is an integer number (9386655241).

Almost surely, 2^18773310481 is an apocalyptic number.

It is an amenable number.

18773310481 is a deficient number, since it is larger than the sum of its proper divisors (1).

18773310481 is an equidigital number, since it uses as much as digits as its factorization.

18773310481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 43.

The spelling of 18773310481 in words is "eighteen billion, seven hundred seventy-three million, three hundred ten thousand, four hundred eighty-one".