2166556449 has 16 divisors (see below), whose sum is σ = 3070872000. Its totient is φ = 1353984000.

The previous prime is 2166556439. The next prime is 2166556451. The reversal of 2166556449 is 9446556612.

It is not a de Polignac number, because 2166556449 - 2⁸ = 2166556193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2166556398 and 2166556407.

It is not an unprimeable number, because it can be changed into a prime (2166556429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71824 + ... + 97425.

It is an arithmetic number, because the mean of its divisors is an integer number (191929500).

Almost surely, 2^2166556449 is an apocalyptic number.

It is an amenable number.

2166556449 is a deficient number, since it is larger than the sum of its proper divisors (904315551).

2166556449 is a wasteful number, since it uses less digits than its factorization.

2166556449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169520.

The product of its digits is 1555200, while the sum is 48.

The square root of 2166556449 is about 46546.2828698490. The cubic root of 2166556449 is about 1293.9674041240.

The spelling of 2166556449 in words is "two billion, one hundred sixty-six million, five hundred fifty-six thousand, four hundred forty-nine".