2065664340 has 72 divisors (see below), whose sum is σ = 6372082080. Its totient is φ = 541504704.

The previous prime is 2065664329. The next prime is 2065664351. The reversal of 2065664340 is 434665602.

2065664340 is a `hidden beast` number, since 2 + 0 + 6 + 5 + 6 + 643 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (2065664329) and next prime (2065664351).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2065664295 and 2065664304.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86634 + ... + 107873.

It is an arithmetic number, because the mean of its divisors is an integer number (88501140).

Almost surely, 2^2065664340 is an apocalyptic number.

2065664340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2065664340 is an abundant number, since it is smaller than the sum of its proper divisors (4306417740).

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

2065664340 is a wasteful number, since it uses less digits than its factorization.

2065664340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194581 (or 194576 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 2065664340 is about 45449.5801960810. The cubic root of 2065664340 is about 1273.5614871882.

The spelling of 2065664340 in words is "two billion, sixty-five million, six hundred sixty-four thousand, three hundred forty".