205696420199 has 4 divisors (see below), whose sum is σ = 205739995440. Its totient is φ = 205652844960.

The previous prime is 205696420133. The next prime is 205696420207. The reversal of 205696420199 is 991024696502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205696420199 is a prime.

It is a super-2 number, since 2×205696420199² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205696420199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205696420129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21780539 + ... + 21789980.

It is an arithmetic number, because the mean of its divisors is an integer number (51434998860).

Almost surely, 2^205696420199 is an apocalyptic number.

205696420199 is a deficient number, since it is larger than the sum of its proper divisors (43575241).

205696420199 is an equidigital number, since it uses as much as digits as its factorization.

205696420199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43575240.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 205696420199 in words is "two hundred five billion, six hundred ninety-six million, four hundred twenty thousand, one hundred ninety-nine".