205170161600121 has 4 divisors (see below), whose sum is σ = 273560215466832. Its totient is φ = 136780107733412.

The previous prime is 205170161600101. The next prime is 205170161600149. The reversal of 205170161600121 is 121006161071502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 205170161600121 - 2⁶ = 205170161600057 is a prime.

It is a super-2 number, since 2×205170161600121² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (205170161600101) 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, 34195026933351 + ... + 34195026933356.

It is an arithmetic number, because the mean of its divisors is an integer number (68390053866708).

Almost surely, 2^{205170161600121} is an apocalyptic number.

It is an amenable number.

205170161600121 is a deficient number, since it is larger than the sum of its proper divisors (68390053866711).

205170161600121 is an equidigital number, since it uses as much as digits as its factorization.

205170161600121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68390053866710.

The product of its (nonzero) digits is 5040, while the sum is 33.

The spelling of 205170161600121 in words is "two hundred five trillion, one hundred seventy billion, one hundred sixty-one million, six hundred thousand, one hundred twenty-one".