2165706625 has 16 divisors (see below), whose sum is σ = 2705683968. Its totient is φ = 1730718000.

The previous prime is 2165706581. The next prime is 2165706629. The reversal of 2165706625 is 5266075612.

It is not a de Polignac number, because 2165706625 - 2¹¹ = 2165704577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165706629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115134 + ... + 132616.

It is an arithmetic number, because the mean of its divisors is an integer number (169105248).

Almost surely, 2^2165706625 is an apocalyptic number.

2165706625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2165706625 is a deficient number, since it is larger than the sum of its proper divisors (539977343).

2165706625 is an equidigital number, since it uses as much as digits as its factorization.

2165706625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18489 (or 18479 counting only the distinct ones).

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

The square root of 2165706625 is about 46537.1531681945. The cubic root of 2165706625 is about 1293.7981973067.

The spelling of 2165706625 in words is "two billion, one hundred sixty-five million, seven hundred six thousand, six hundred twenty-five".