205104835979 has 8 divisors (see below), whose sum is σ = 212182500000. Its totient is φ = 198027510912.

The previous prime is 205104835937. The next prime is 205104836029. The reversal of 205104835979 is 979538401502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205104835979 is a prime.

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 205104835979.

It is not an unprimeable number, because it can be changed into a prime (205104835879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2111522 + ... + 2206520.

It is an arithmetic number, because the mean of its divisors is an integer number (26522812500).

Almost surely, 2^205104835979 is an apocalyptic number.

205104835979 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

205104835979 is a deficient number, since it is larger than the sum of its proper divisors (7077664021).

205104835979 is an equidigital number, since it uses as much as digits as its factorization.

205104835979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169477.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The spelling of 205104835979 in words is "two hundred five billion, one hundred four million, eight hundred thirty-five thousand, nine hundred seventy-nine".