18312728783 has 2 divisors, whose sum is σ = 18312728784. Its totient is φ = 18312728782.

The previous prime is 18312728771. The next prime is 18312728839. The reversal of 18312728783 is 38782721381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18312728783 - 2⁴ = 18312728767 is a prime.

It is a super-2 number, since 2×18312728783² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18312728723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9156364391 + 9156364392.

It is an arithmetic number, because the mean of its divisors is an integer number (9156364392).

Almost surely, 2^18312728783 is an apocalyptic number.

18312728783 is a deficient number, since it is larger than the sum of its proper divisors (1).

18312728783 is an equidigital number, since it uses as much as digits as its factorization.

18312728783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 50.

The spelling of 18312728783 in words is "eighteen billion, three hundred twelve million, seven hundred twenty-eight thousand, seven hundred eighty-three".