115514666521 has 4 divisors (see below), whose sum is σ = 115516037412. Its totient is φ = 115513295632.

The previous prime is 115514666507. The next prime is 115514666539. The reversal of 115514666521 is 125666415511.

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 77723306521 + 37791360000 = 278789^2 + 194400^2 .

It is a cyclic number.

It is not a de Polignac number, because 115514666521 - 2²¹ = 115512569369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115514666021) 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, 550150 + ... + 730543.

It is an arithmetic number, because the mean of its divisors is an integer number (28879009353).

Almost surely, 2^115514666521 is an apocalyptic number.

It is an amenable number.

115514666521 is a deficient number, since it is larger than the sum of its proper divisors (1370891).

115514666521 is an equidigital number, since it uses as much as digits as its factorization.

115514666521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1370890.

The product of its digits is 216000, while the sum is 43.

The spelling of 115514666521 in words is "one hundred fifteen billion, five hundred fourteen million, six hundred sixty-six thousand, five hundred twenty-one".