2170643664 has 40 divisors (see below), whose sum is σ = 6408568000. Its totient is φ = 620183808.

The previous prime is 2170643663. The next prime is 2170643681. The reversal of 2170643664 is 4663460712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2170643663) 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 7 ways as a sum of consecutive naturals, for example, 3229789 + ... + 3230460.

It is an arithmetic number, because the mean of its divisors is an integer number (160214200).

Almost surely, 2^2170643664 is an apocalyptic number.

2170643664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2170643664 is an abundant number, since it is smaller than the sum of its proper divisors (4237924336).

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

2170643664 is a wasteful number, since it uses less digits than its factorization.

2170643664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6460267 (or 6460261 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 39.

The square root of 2170643664 is about 46590.1670312524. The cubic root of 2170643664 is about 1294.7805840648.

The spelling of 2170643664 in words is "two billion, one hundred seventy million, six hundred forty-three thousand, six hundred sixty-four".