18406302973 has 2 divisors, whose sum is σ = 18406302974. Its totient is φ = 18406302972.

The previous prime is 18406302841. The next prime is 18406303007. The reversal of 18406302973 is 37920360481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16322106564 + 2084196409 = 127758^2 + 45653^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18406302973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18406312973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9203151486 + 9203151487.

It is an arithmetic number, because the mean of its divisors is an integer number (9203151487).

Almost surely, 2^18406302973 is an apocalyptic number.

It is an amenable number.

18406302973 is a deficient number, since it is larger than the sum of its proper divisors (1).

18406302973 is an equidigital number, since it uses as much as digits as its factorization.

18406302973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 18406302973 in words is "eighteen billion, four hundred six million, three hundred two thousand, nine hundred seventy-three".