2065694399 has 4 divisors (see below), whose sum is σ = 2071145160. Its totient is φ = 2060243640.

The previous prime is 2065694387. The next prime is 2065694413. The reversal of 2065694399 is 9934965602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9934965602 = 2 ⋅4967482801.

It is a cyclic number.

It is not a de Polignac number, because 2065694399 - 2¹² = 2065690303 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2065694399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2065694339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2724812 + ... + 2725569.

It is an arithmetic number, because the mean of its divisors is an integer number (517786290).

Almost surely, 2^2065694399 is an apocalyptic number.

2065694399 is a deficient number, since it is larger than the sum of its proper divisors (5450761).

2065694399 is an equidigital number, since it uses as much as digits as its factorization.

2065694399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5450760.

The product of its (nonzero) digits is 3149280, while the sum is 53.

The square root of 2065694399 is about 45449.9108800006. The cubic root of 2065694399 is about 1273.5676646680.

The spelling of 2065694399 in words is "two billion, sixty-five million, six hundred ninety-four thousand, three hundred ninety-nine".