2643427649 has 4 divisors (see below), whose sum is σ = 2782555440. Its totient is φ = 2504299860.

The previous prime is 2643427637. The next prime is 2643427673. The reversal of 2643427649 is 9467243462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9467243462 = 2 ⋅4733621731.

It is a cyclic number.

It is not a de Polignac number, because 2643427649 - 2¹² = 2643423553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2643427249) 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, 69563867 + ... + 69563904.

It is an arithmetic number, because the mean of its divisors is an integer number (695638860).

Almost surely, 2^2643427649 is an apocalyptic number.

It is an amenable number.

2643427649 is a deficient number, since it is larger than the sum of its proper divisors (139127791).

2643427649 is a wasteful number, since it uses less digits than its factorization.

2643427649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139127790.

The product of its digits is 1741824, while the sum is 47.

The square root of 2643427649 is about 51414.2747590589. The cubic root of 2643427649 is about 1382.6825313942.

The spelling of 2643427649 in words is "two billion, six hundred forty-three million, four hundred twenty-seven thousand, six hundred forty-nine".