2166620565055 has 8 divisors (see below), whose sum is σ = 2601329848992. Its totient is φ = 1732373004768.

The previous prime is 2166620564893. The next prime is 2166620565071. The reversal of 2166620565055 is 5505650266612.

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

It is a cyclic number.

It is not a de Polignac number, because 2166620565055 - 2²¹ = 2166618467903 is a prime.

It is a Duffinian number.

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, 115420587 + ... + 115439356.

It is an arithmetic number, because the mean of its divisors is an integer number (325166231124).

Almost surely, 2^{2166620565055} is an apocalyptic number.

2166620565055 is a deficient number, since it is larger than the sum of its proper divisors (434709283937).

2166620565055 is a wasteful number, since it uses less digits than its factorization.

2166620565055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230861825.

The product of its (nonzero) digits is 3240000, while the sum is 49.

The spelling of 2166620565055 in words is "two trillion, one hundred sixty-six billion, six hundred twenty million, five hundred sixty-five thousand, fifty-five".