16978420903 has 2 divisors, whose sum is σ = 16978420904. Its totient is φ = 16978420902.

The previous prime is 16978420891. The next prime is 16978420933. The reversal of 16978420903 is 30902487961.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16978420903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16978420933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8489210451 + 8489210452.

It is an arithmetic number, because the mean of its divisors is an integer number (8489210452).

Almost surely, 2^16978420903 is an apocalyptic number.

16978420903 is a deficient number, since it is larger than the sum of its proper divisors (1).

16978420903 is an equidigital number, since it uses as much as digits as its factorization.

16978420903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 16978420903 in words is "sixteen billion, nine hundred seventy-eight million, four hundred twenty thousand, nine hundred three".