2166686645 has 8 divisors (see below), whose sum is σ = 2600288160. Its totient is φ = 1733173200.

The previous prime is 2166686617. The next prime is 2166686659. The reversal of 2166686645 is 5466866612.

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

It is not a de Polignac number, because 2166686645 - 2¹⁰ = 2166685621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2166686593 and 2166686602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59666 + ... + 88844.

It is an arithmetic number, because the mean of its divisors is an integer number (325036020).

Almost surely, 2^2166686645 is an apocalyptic number.

It is an amenable number.

2166686645 is a deficient number, since it is larger than the sum of its proper divisors (433601515).

2166686645 is a wasteful number, since it uses less digits than its factorization.

2166686645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44035.

The product of its digits is 2488320, while the sum is 50.

The square root of 2166686645 is about 46547.6814137933. The cubic root of 2166686645 is about 1293.9933232895.

The spelling of 2166686645 in words is "two billion, one hundred sixty-six million, six hundred eighty-six thousand, six hundred forty-five".