66026221515115 has 4 divisors (see below), whose sum is σ = 79231465818144. Its totient is φ = 52820977212088.

The previous prime is 66026221515041. The next prime is 66026221515157. The reversal of 66026221515115 is 51151512262066.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66026221515115 is a prime.

It is a Duffinian 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, 6602622151507 + ... + 6602622151516.

It is an arithmetic number, because the mean of its divisors is an integer number (19807866454536).

Almost surely, 2^{66026221515115} is an apocalyptic number.

66026221515115 is a deficient number, since it is larger than the sum of its proper divisors (13205244303029).

66026221515115 is a wasteful number, since it uses less digits than its factorization.

66026221515115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13205244303028.

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

The spelling of 66026221515115 in words is "sixty-six trillion, twenty-six billion, two hundred twenty-one million, five hundred fifteen thousand, one hundred fifteen".