2166072565 has 8 divisors (see below), whose sum is σ = 2626084440. Its totient is φ = 1714993152.

The previous prime is 2166072551. The next prime is 2166072569. The reversal of 2166072565 is 5652706612.

It can be written as a sum of positive squares in 4 ways, for example, as 220997956 + 1945074609 = 14866^2 + 44103^2 .

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 2166072565 - 2⁵ = 2166072533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166072569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2232580 + ... + 2233549.

It is an arithmetic number, because the mean of its divisors is an integer number (328260555).

Almost surely, 2^2166072565 is an apocalyptic number.

It is an amenable number.

2166072565 is a deficient number, since it is larger than the sum of its proper divisors (460011875).

2166072565 is an equidigital number, since it uses as much as digits as its factorization.

2166072565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4466231.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 2166072565 is about 46541.0846994352. The cubic root of 2166072565 is about 1293.8710643397.

The spelling of 2166072565 in words is "two billion, one hundred sixty-six million, seventy-two thousand, five hundred sixty-five".