121566101705 has 4 divisors (see below), whose sum is σ = 145879322052. Its totient is φ = 97252881360.

The previous prime is 121566101677. The next prime is 121566101717. The reversal of 121566101705 is 507101665121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27388926016 + 94177175689 = 165496^2 + 306883^2 .

It is not a de Polignac number, because 121566101705 - 2¹⁰ = 121566100681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12156610166 + ... + 12156610175.

It is an arithmetic number, because the mean of its divisors is an integer number (36469830513).

Almost surely, 2^121566101705 is an apocalyptic number.

It is an amenable number.

121566101705 is a deficient number, since it is larger than the sum of its proper divisors (24313220347).

121566101705 is an equidigital number, since it uses as much as digits as its factorization.

121566101705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24313220346.

The product of its (nonzero) digits is 12600, while the sum is 35.

Adding to 121566101705 its reverse (507101665121), we get a palindrome (628667766826).

The spelling of 121566101705 in words is "one hundred twenty-one billion, five hundred sixty-six million, one hundred one thousand, seven hundred five".