2165532776645 has 16 divisors (see below), whose sum is σ = 2977508177280. Its totient is φ = 1481119433664.

The previous prime is 2165532776611. The next prime is 2165532776647. The reversal of 2165532776645 is 5466772355612.

It is a cyclic number.

It is not a de Polignac number, because 2165532776645 - 2²⁰ = 2165531728069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165532776647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79513847 + ... + 79541076.

It is an arithmetic number, because the mean of its divisors is an integer number (186094261080).

Almost surely, 2^{2165532776645} is an apocalyptic number.

It is an amenable number.

2165532776645 is a deficient number, since it is larger than the sum of its proper divisors (811975400635).

2165532776645 is a wasteful number, since it uses less digits than its factorization.

2165532776645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159055324.

The product of its digits is 63504000, while the sum is 59.

The spelling of 2165532776645 in words is "two trillion, one hundred sixty-five billion, five hundred thirty-two million, seven hundred seventy-six thousand, six hundred forty-five".