6746961721 has 4 divisors (see below), whose sum is σ = 6747134500. Its totient is φ = 6746788944.

The previous prime is 6746961713. The next prime is 6746961757. The reversal of 6746961721 is 1271696476.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3706983225 + 3039978496 = 60885^2 + 55136^2 .

It is a cyclic number.

It is not a de Polignac number, because 6746961721 - 2³ = 6746961713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6746991721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3055 + ... + 116203.

It is an arithmetic number, because the mean of its divisors is an integer number (1686783625).

Almost surely, 2^6746961721 is an apocalyptic number.

It is an amenable number.

6746961721 is a deficient number, since it is larger than the sum of its proper divisors (172779).

6746961721 is a wasteful number, since it uses less digits than its factorization.

6746961721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172778.

The product of its digits is 762048, while the sum is 49.

The square root of 6746961721 is about 82139.8911674468. The cubic root of 6746961721 is about 1889.5979773492.

The spelling of 6746961721 in words is "six billion, seven hundred forty-six million, nine hundred sixty-one thousand, seven hundred twenty-one".