2065644399 has 48 divisors (see below), whose sum is σ = 3484497408. Its totient is φ = 1059931008.

The previous prime is 2065644377. The next prime is 2065644431. The reversal of 2065644399 is 9934465602.

It is not a de Polignac number, because 2065644399 - 2⁷ = 2065644271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2065644319) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 370974 + ... + 376500.

It is an arithmetic number, because the mean of its divisors is an integer number (72593696).

Almost surely, 2^2065644399 is an apocalyptic number.

2065644399 is a deficient number, since it is larger than the sum of its proper divisors (1418853009).

2065644399 is a wasteful number, since it uses less digits than its factorization.

2065644399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5624 (or 5587 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 48.

The square root of 2065644399 is about 45449.3608205880. The cubic root of 2065644399 is about 1273.5573890440.

The spelling of 2065644399 in words is "two billion, sixty-five million, six hundred forty-four thousand, three hundred ninety-nine".