18768007997 has 2 divisors, whose sum is σ = 18768007998. Its totient is φ = 18768007996.

The previous prime is 18768007969. The next prime is 18768008009. The reversal of 18768007997 is 79970086781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16173226276 + 2594781721 = 127174^2 + 50939^2 .

It is a cyclic number.

It is not a de Polignac number, because 18768007997 - 2¹⁸ = 18767745853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18768007597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9384003998 + 9384003999.

It is an arithmetic number, because the mean of its divisors is an integer number (9384003999).

Almost surely, 2^18768007997 is an apocalyptic number.

It is an amenable number.

18768007997 is a deficient number, since it is larger than the sum of its proper divisors (1).

18768007997 is an equidigital number, since it uses as much as digits as its factorization.

18768007997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10668672, while the sum is 62.

The spelling of 18768007997 in words is "eighteen billion, seven hundred sixty-eight million, seven thousand, nine hundred ninety-seven".