2068649639 has 4 divisors (see below), whose sum is σ = 2364171024. Its totient is φ = 1773128256.

The previous prime is 2068649621. The next prime is 2068649657. The reversal of 2068649639 is 9369468602.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2068649621) and next prime (2068649657).

It is a cyclic number.

It is not a de Polignac number, because 2068649639 - 2¹⁶ = 2068584103 is a prime.

It is a super-2 number, since 2×2068649639² = 8558622657869660642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2068649669) 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, 147760682 + ... + 147760695.

It is an arithmetic number, because the mean of its divisors is an integer number (591042756).

Almost surely, 2^2068649639 is an apocalyptic number.

2068649639 is a deficient number, since it is larger than the sum of its proper divisors (295521385).

2068649639 is an equidigital number, since it uses as much as digits as its factorization.

2068649639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295521384.

The product of its (nonzero) digits is 3359232, while the sum is 53.

The square root of 2068649639 is about 45482.4102153789. The cubic root of 2068649639 is about 1274.1747090781.

The spelling of 2068649639 in words is "two billion, sixty-eight million, six hundred forty-nine thousand, six hundred thirty-nine".