205106399983 has 2 divisors, whose sum is σ = 205106399984. Its totient is φ = 205106399982.

The previous prime is 205106399969. The next prime is 205106400011. The reversal of 205106399983 is 389993601502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205106399983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205106399923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102553199991 + 102553199992.

It is an arithmetic number, because the mean of its divisors is an integer number (102553199992).

Almost surely, 2^205106399983 is an apocalyptic number.

205106399983 is a deficient number, since it is larger than the sum of its proper divisors (1).

205106399983 is an equidigital number, since it uses as much as digits as its factorization.

205106399983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3149280, while the sum is 55.

The spelling of 205106399983 in words is "two hundred five billion, one hundred six million, three hundred ninety-nine thousand, nine hundred eighty-three".