18746998973 has 2 divisors, whose sum is σ = 18746998974. Its totient is φ = 18746998972.

The previous prime is 18746998943. The next prime is 18746999041. The reversal of 18746998973 is 37989964781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15303421849 + 3443577124 = 123707^2 + 58682^2 .

It is a cyclic number.

It is not a de Polignac number, because 18746998973 - 2⁶ = 18746998909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18746998897 and 18746998906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18746998903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9373499486 + 9373499487.

It is an arithmetic number, because the mean of its divisors is an integer number (9373499487).

Almost surely, 2^18746998973 is an apocalyptic number.

It is an amenable number.

18746998973 is a deficient number, since it is larger than the sum of its proper divisors (1).

18746998973 is an equidigital number, since it uses as much as digits as its factorization.

18746998973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 164602368, while the sum is 71.

The spelling of 18746998973 in words is "eighteen billion, seven hundred forty-six million, nine hundred ninety-eight thousand, nine hundred seventy-three".