5706721661 has 8 divisors (see below), whose sum is σ = 5741351904. Its totient is φ = 5672175120.

The previous prime is 5706721639. The next prime is 5706721667. The reversal of 5706721661 is 1661276075.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5706721661 - 2⁶ = 5706721597 is a prime.

It is a super-2 number, since 2×5706721661² = 65133344232253197842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5706721667) 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 7 ways as a sum of consecutive naturals, for example, 118646 + ... + 159656.

It is an arithmetic number, because the mean of its divisors is an integer number (717668988).

Almost surely, 2^5706721661 is an apocalyptic number.

It is an amenable number.

5706721661 is a deficient number, since it is larger than the sum of its proper divisors (34630243).

5706721661 is a wasteful number, since it uses less digits than its factorization.

5706721661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41851.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 5706721661 is about 75542.8465243401. The cubic root of 5706721661 is about 1787.0178762395.

The spelling of 5706721661 in words is "five billion, seven hundred six million, seven hundred twenty-one thousand, six hundred sixty-one".