1908778653203 has 2 divisors, whose sum is σ = 1908778653204. Its totient is φ = 1908778653202.

The previous prime is 1908778653149. The next prime is 1908778653227. The reversal of 1908778653203 is 3023568778091.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1908778653203 is a prime.

It is not a weakly prime, because it can be changed into another prime (1908778653293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954389326601 + 954389326602.

It is an arithmetic number, because the mean of its divisors is an integer number (954389326602).

Almost surely, 2^{1908778653203} is an apocalyptic number.

1908778653203 is a deficient number, since it is larger than the sum of its proper divisors (1).

1908778653203 is an equidigital number, since it uses as much as digits as its factorization.

1908778653203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15240960, while the sum is 59.

The spelling of 1908778653203 in words is "one trillion, nine hundred eight billion, seven hundred seventy-eight million, six hundred fifty-three thousand, two hundred three".