121520561126665 has 8 divisors (see below), whose sum is σ = 145824970448520. Its totient is φ = 97216250836992.

The previous prime is 121520561126659. The next prime is 121520561126683. The reversal of 121520561126665 is 566621165025121.

It can be written as a sum of positive squares in 4 ways, for example, as 68634911975161 + 52885649151504 = 8284619^2 + 7272252^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 121520561126665 - 2²⁵ = 121520527572233 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22031160 + ... + 26989129.

It is an arithmetic number, because the mean of its divisors is an integer number (18228121306065).

Almost surely, 2^{121520561126665} is an apocalyptic number.

It is an amenable number.

121520561126665 is a deficient number, since it is larger than the sum of its proper divisors (24304409321855).

121520561126665 is an equidigital number, since it uses as much as digits as its factorization.

121520561126665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49516091.

The product of its (nonzero) digits is 1296000, while the sum is 49.

The spelling of 121520561126665 in words is "one hundred twenty-one trillion, five hundred twenty billion, five hundred sixty-one million, one hundred twenty-six thousand, six hundred sixty-five".