2648337721 has 4 divisors (see below), whose sum is σ = 2671774452. Its totient is φ = 2624900992.

The previous prime is 2648337709. The next prime is 2648337733. The reversal of 2648337721 is 1277338462.

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 (2648337709) and next prime (2648337733).

It can be written as a sum of positive squares in 2 ways, for example, as 496398400 + 2151939321 = 22280^2 + 46389^2 .

It is a cyclic number.

It is not a de Polignac number, because 2648337721 - 2²³ = 2639949113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2648337221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11718196 + ... + 11718421.

It is an arithmetic number, because the mean of its divisors is an integer number (667943613).

Almost surely, 2^2648337721 is an apocalyptic number.

It is an amenable number.

2648337721 is a deficient number, since it is larger than the sum of its proper divisors (23436731).

2648337721 is a wasteful number, since it uses less digits than its factorization.

2648337721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23436730.

The product of its digits is 338688, while the sum is 43.

The square root of 2648337721 is about 51462.0026913061. The cubic root of 2648337721 is about 1383.5380962807.

The spelling of 2648337721 in words is "two billion, six hundred forty-eight million, three hundred thirty-seven thousand, seven hundred twenty-one".