2166582457 has 4 divisors (see below), whose sum is σ = 2333242660. Its totient is φ = 1999922256.

The previous prime is 2166582437. The next prime is 2166582461. The reversal of 2166582457 is 7542856612.

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 474411961 + 1692170496 = 21781^2 + 41136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2166582457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166582437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83330082 + ... + 83330107.

It is an arithmetic number, because the mean of its divisors is an integer number (583310665).

Almost surely, 2^2166582457 is an apocalyptic number.

It is an amenable number.

2166582457 is a deficient number, since it is larger than the sum of its proper divisors (166660203).

2166582457 is a wasteful number, since it uses less digits than its factorization.

2166582457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166660202.

The product of its digits is 806400, while the sum is 46.

The square root of 2166582457 is about 46546.5622468513. The cubic root of 2166582457 is about 1293.9725818289.

The spelling of 2166582457 in words is "two billion, one hundred sixty-six million, five hundred eighty-two thousand, four hundred fifty-seven".