9721693366 has 16 divisors (see below), whose sum is σ = 18180829440. Its totient is φ = 3787672680.

The previous prime is 9721693327. The next prime is 9721693391. The reversal of 9721693366 is 6633961279.

It is a super-2 number, since 2×9721693366² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31563786 + ... + 31564093.

It is an arithmetic number, because the mean of its divisors is an integer number (1136301840).

Almost surely, 2^9721693366 is an apocalyptic number.

9721693366 is a deficient number, since it is larger than the sum of its proper divisors (8459136074).

9721693366 is a wasteful number, since it uses less digits than its factorization.

9721693366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63127899.

The product of its digits is 2204496, while the sum is 52.

The square root of 9721693366 is about 98598.6478913377. The cubic root of 9721693366 is about 2134.2599080531.

The spelling of 9721693366 in words is "nine billion, seven hundred twenty-one million, six hundred ninety-three thousand, three hundred sixty-six".