18978368701 has 2 divisors, whose sum is σ = 18978368702. Its totient is φ = 18978368700.

The previous prime is 18978368639. The next prime is 18978368719. The reversal of 18978368701 is 10786387981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9609096676 + 9369272025 = 98026^2 + 96795^2 .

It is an emirp because it is prime and its reverse (10786387981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18978368701 - 2²¹ = 18976271549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18978468701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9489184350 + 9489184351.

It is an arithmetic number, because the mean of its divisors is an integer number (9489184351).

Almost surely, 2^18978368701 is an apocalyptic number.

It is an amenable number.

18978368701 is a deficient number, since it is larger than the sum of its proper divisors (1).

18978368701 is an equidigital number, since it uses as much as digits as its factorization.

18978368701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 58.

The spelling of 18978368701 in words is "eighteen billion, nine hundred seventy-eight million, three hundred sixty-eight thousand, seven hundred one".