1115166166221 has 32 divisors (see below), whose sum is σ = 1526667429888. Its totient is φ = 723814453440.

The previous prime is 1115166166139. The next prime is 1115166166253. The reversal of 1115166166221 is 1226616615111.

It is not a de Polignac number, because 1115166166221 - 2¹⁴ = 1115166149837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1115166166221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115166166291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23924280 + ... + 23970846.

It is an arithmetic number, because the mean of its divisors is an integer number (47708357184).

Almost surely, 2^{1115166166221} is an apocalyptic number.

It is an amenable number.

1115166166221 is a deficient number, since it is larger than the sum of its proper divisors (411501263667).

1115166166221 is a wasteful number, since it uses less digits than its factorization.

1115166166221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47961.

The product of its digits is 25920, while the sum is 39.

The spelling of 1115166166221 in words is "one trillion, one hundred fifteen billion, one hundred sixty-six million, one hundred sixty-six thousand, two hundred twenty-one".