2165504166045 has 36 divisors (see below), whose sum is σ = 4125792520668. Its totient is φ = 1049941411200.

The previous prime is 2165504166029. The next prime is 2165504166121. The reversal of 2165504166045 is 5406614055612.

2165504166045 is a `hidden beast` number, since 2 + 16 + 550 + 41 + 6 + 6 + 0 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1492372527129 + 673131638916 = 1221627^2 + 820446^2 .

It is not a de Polignac number, because 2165504166045 - 2⁴ = 2165504166029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 198847096 + ... + 198857985.

Almost surely, 2^{2165504166045} is an apocalyptic number.

It is an amenable number.

2165504166045 is a deficient number, since it is larger than the sum of its proper divisors (1960288354623).

2165504166045 is a wasteful number, since it uses less digits than its factorization.

2165504166045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397705114 (or 397705100 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 2165504166045 in words is "two trillion, one hundred sixty-five billion, five hundred four million, one hundred sixty-six thousand, forty-five".