203999366401 has 2 divisors, whose sum is σ = 203999366402. Its totient is φ = 203999366400.

The previous prime is 203999366381. The next prime is 203999366411. The reversal of 203999366401 is 104663999302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196028448001 + 7970918400 = 442751^2 + 89280^2 .

It is a cyclic number.

It is not a de Polignac number, because 203999366401 - 2⁷ = 203999366273 is a prime.

It is not a weakly prime, because it can be changed into another prime (203999366411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101999683200 + 101999683201.

It is an arithmetic number, because the mean of its divisors is an integer number (101999683201).

Almost surely, 2^203999366401 is an apocalyptic number.

It is an amenable number.

203999366401 is a deficient number, since it is larger than the sum of its proper divisors (1).

203999366401 is an equidigital number, since it uses as much as digits as its factorization.

203999366401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1889568, while the sum is 52.

The spelling of 203999366401 in words is "two hundred three billion, nine hundred ninety-nine million, three hundred sixty-six thousand, four hundred one".