2166013094965 has 4 divisors (see below), whose sum is σ = 2599215713964. Its totient is φ = 1732810475968.

The previous prime is 2166013094957. The next prime is 2166013094977. The reversal of 2166013094965 is 5694903106612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 790379675089 + 1375633419876 = 889033^2 + 1172874^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166013094965 - 2³ = 2166013094957 is a prime.

It is a super-2 number, since 2×2166013094965² (a number of 25 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 216601309492 + ... + 216601309501.

It is an arithmetic number, because the mean of its divisors is an integer number (649803928491).

Almost surely, 2^{2166013094965} is an apocalyptic number.

It is an amenable number.

2166013094965 is a deficient number, since it is larger than the sum of its proper divisors (433202618999).

2166013094965 is an equidigital number, since it uses as much as digits as its factorization.

2166013094965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433202618998.

The product of its (nonzero) digits is 2099520, while the sum is 52.

The spelling of 2166013094965 in words is "two trillion, one hundred sixty-six billion, thirteen million, ninety-four thousand, nine hundred sixty-five".