205550121611651 has 8 divisors (see below), whose sum is σ = 208075473466560. Its totient is φ = 203025932717992.

The previous prime is 205550121611609. The next prime is 205550121611677. The reversal of 205550121611651 is 156116121055502.

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-205550121611651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205550121611599 and 205550121611608.

It is not an unprimeable number, because it can be changed into a prime (205550121611251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290384645 + ... + 291091638.

It is an arithmetic number, because the mean of its divisors is an integer number (26009434183320).

Almost surely, 2^{205550121611651} is an apocalyptic number.

205550121611651 is a deficient number, since it is larger than the sum of its proper divisors (2525351854909).

205550121611651 is an equidigital number, since it uses as much as digits as its factorization.

205550121611651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581480625.

The product of its (nonzero) digits is 90000, while the sum is 41.

The spelling of 205550121611651 in words is "two hundred five trillion, five hundred fifty billion, one hundred twenty-one million, six hundred eleven thousand, six hundred fifty-one".