18739981783 has 2 divisors, whose sum is σ = 18739981784. Its totient is φ = 18739981782.

The previous prime is 18739981763. The next prime is 18739981787. The reversal of 18739981783 is 38718993781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18739981783 - 2¹⁷ = 18739850711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18739981787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9369990891 + 9369990892.

It is an arithmetic number, because the mean of its divisors is an integer number (9369990892).

Almost surely, 2^18739981783 is an apocalyptic number.

18739981783 is a deficient number, since it is larger than the sum of its proper divisors (1).

18739981783 is an equidigital number, since it uses as much as digits as its factorization.

18739981783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18289152, while the sum is 64.

It can be divided in two parts, 1873998 and 1783, that added together give a palindrome (1875781).

The spelling of 18739981783 in words is "eighteen billion, seven hundred thirty-nine million, nine hundred eighty-one thousand, seven hundred eighty-three".