18378808403 has 2 divisors, whose sum is σ = 18378808404. Its totient is φ = 18378808402.

The previous prime is 18378808369. The next prime is 18378808423. The reversal of 18378808403 is 30480887381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18378808403 - 2⁶ = 18378808339 is a prime.

It is not a weakly prime, because it can be changed into another prime (18378808423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9189404201 + 9189404202.

It is an arithmetic number, because the mean of its divisors is an integer number (9189404202).

Almost surely, 2^18378808403 is an apocalyptic number.

18378808403 is a deficient number, since it is larger than the sum of its proper divisors (1).

18378808403 is an equidigital number, since it uses as much as digits as its factorization.

18378808403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1032192, while the sum is 50.

The spelling of 18378808403 in words is "eighteen billion, three hundred seventy-eight million, eight hundred eight thousand, four hundred three".