6763644721 has 4 divisors (see below), whose sum is σ = 6765783552. Its totient is φ = 6761505892.

The previous prime is 6763644689. The next prime is 6763644751. The reversal of 6763644721 is 1274463676.

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.

It is a cyclic number.

It is not a de Polignac number, because 6763644721 - 2⁵ = 6763644689 is a prime.

It is a super-2 number, since 2×6763644721² = 91493779823822335682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6763644751) 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, 1064665 + ... + 1070998.

It is an arithmetic number, because the mean of its divisors is an integer number (1691445888).

Almost surely, 2^6763644721 is an apocalyptic number.

It is an amenable number.

6763644721 is a deficient number, since it is larger than the sum of its proper divisors (2138831).

6763644721 is a wasteful number, since it uses less digits than its factorization.

6763644721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2138830.

The product of its digits is 1016064, while the sum is 46.

The square root of 6763644721 is about 82241.3808310634. The cubic root of 6763644721 is about 1891.1541452490.

The spelling of 6763644721 in words is "six billion, seven hundred sixty-three million, six hundred forty-four thousand, seven hundred twenty-one".