18928206403 has 2 divisors, whose sum is σ = 18928206404. Its totient is φ = 18928206402.

The previous prime is 18928206397. The next prime is 18928206443. The reversal of 18928206403 is 30460282981.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18928206403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18928206403.

It is not a weakly prime, because it can be changed into another prime (18928206443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9464103201 + 9464103202.

It is an arithmetic number, because the mean of its divisors is an integer number (9464103202).

Almost surely, 2^18928206403 is an apocalyptic number.

18928206403 is a deficient number, since it is larger than the sum of its proper divisors (1).

18928206403 is an equidigital number, since it uses as much as digits as its factorization.

18928206403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 43.

The spelling of 18928206403 in words is "eighteen billion, nine hundred twenty-eight million, two hundred six thousand, four hundred three".