11451521514665 has 4 divisors (see below), whose sum is σ = 13741825817604. Its totient is φ = 9161217211728.

The previous prime is 11451521514623. The next prime is 11451521514707. The reversal of 11451521514665 is 56641512515411.

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

It is an interprime number because it is at equal distance from previous prime (11451521514623) and next prime (11451521514707).

It can be written as a sum of positive squares in 2 ways, for example, as 5158226795929 + 6293294718736 = 2271173^2 + 2508644^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11451521514665 is a prime.

It is a super-2 number, since 2×11451521514665² (a number of 27 digits) contains 22 as substring.

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, 1145152151462 + ... + 1145152151471.

It is an arithmetic number, because the mean of its divisors is an integer number (3435456454401).

Almost surely, 2^{11451521514665} is an apocalyptic number.

It is an amenable number.

11451521514665 is a deficient number, since it is larger than the sum of its proper divisors (2290304302939).

11451521514665 is an equidigital number, since it uses as much as digits as its factorization.

11451521514665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290304302938.

The product of its digits is 720000, while the sum is 47.

The spelling of 11451521514665 in words is "eleven trillion, four hundred fifty-one billion, five hundred twenty-one million, five hundred fourteen thousand, six hundred sixty-five".