2166745671449 has 8 divisors (see below), whose sum is σ = 2241908497920. Its totient is φ = 2091612675600.

The previous prime is 2166745671371. The next prime is 2166745671463. The reversal of 2166745671449 is 9441765476612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2166745671449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2166745671391 and 2166745671400.

It is not an unprimeable number, because it can be changed into a prime (2166745671479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7309817 + ... + 7600454.

It is an arithmetic number, because the mean of its divisors is an integer number (280238562240).

Almost surely, 2^{2166745671449} is an apocalyptic number.

2166745671449 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2166745671449 is a deficient number, since it is larger than the sum of its proper divisors (75162826471).

2166745671449 is a wasteful number, since it uses less digits than its factorization.

2166745671449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14915311.

The product of its digits is 60963840, while the sum is 62.

The spelling of 2166745671449 in words is "two trillion, one hundred sixty-six billion, seven hundred forty-five million, six hundred seventy-one thousand, four hundred forty-nine".