6706232721 has 24 divisors (see below), whose sum is σ = 9956342760. Its totient is φ = 4346597376.

The previous prime is 6706232717. The next prime is 6706232737. The reversal of 6706232721 is 1272326076.

It is a happy number.

6706232721 is a `hidden beast` number, since 6 + 7 + 0 + 623 + 2 + 7 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 41796225 + 6664436496 = 6465^2 + 81636^2 .

It is not a de Polignac number, because 6706232721 - 2² = 6706232717 is a prime.

It is a super-2 number, since 2×6706232721² = 89947114616422127682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6706232021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 462051 + ... + 476343.

It is an arithmetic number, because the mean of its divisors is an integer number (414847615).

Almost surely, 2^6706232721 is an apocalyptic number.

It is an amenable number.

6706232721 is a deficient number, since it is larger than the sum of its proper divisors (3250110039).

6706232721 is a wasteful number, since it uses less digits than its factorization.

6706232721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15745 (or 15742 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 6706232721 is about 81891.5912716318. The cubic root of 6706232721 is about 1885.7880243868.

Adding to 6706232721 its reverse (1272326076), we get a palindrome (7978558797).

It can be divided in two parts, 6706232 and 721, that added together give a triangular number (6706953 = T₃₆₆₂).

The spelling of 6706232721 in words is "six billion, seven hundred six million, two hundred thirty-two thousand, seven hundred twenty-one".