2165209464 has 32 divisors (see below), whose sum is σ = 5905117440. Its totient is φ = 656124000.

The previous prime is 2165209393. The next prime is 2165209469. The reversal of 2165209464 is 4649025612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165209469) 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, 4100512 + ... + 4101039.

It is an arithmetic number, because the mean of its divisors is an integer number (184534920).

Almost surely, 2^2165209464 is an apocalyptic number.

2165209464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2165209464 is an abundant number, since it is smaller than the sum of its proper divisors (3739907976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2165209464 is a wasteful number, since it uses less digits than its factorization.

2165209464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8201571 (or 8201567 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 2165209464 is about 46531.8113122625. The cubic root of 2165209464 is about 1293.6991880158.

The spelling of 2165209464 in words is "two billion, one hundred sixty-five million, two hundred nine thousand, four hundred sixty-four".