18978076783 has 2 divisors, whose sum is σ = 18978076784. Its totient is φ = 18978076782.

The previous prime is 18978076723. The next prime is 18978076787. The reversal of 18978076783 is 38767087981.

It is a strong prime.

It is an emirp because it is prime and its reverse (38767087981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18978076783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18978076787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9489038391 + 9489038392.

It is an arithmetic number, because the mean of its divisors is an integer number (9489038392).

Almost surely, 2^18978076783 is an apocalyptic number.

18978076783 is a deficient number, since it is larger than the sum of its proper divisors (1).

18978076783 is an equidigital number, since it uses as much as digits as its factorization.

18978076783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28449792, while the sum is 64.

The spelling of 18978076783 in words is "eighteen billion, nine hundred seventy-eight million, seventy-six thousand, seven hundred eighty-three".