9937920661 has 8 divisors (see below), whose sum is σ = 10565665920. Its totient is φ = 9326480592.

The previous prime is 9937920649. The next prime is 9937920689. The reversal of 9937920661 is 1660297399.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9937920661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9937920599 and 9937920608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9937920611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4075041 + ... + 4077478.

It is an arithmetic number, because the mean of its divisors is an integer number (1320708240).

Almost surely, 2^9937920661 is an apocalyptic number.

It is an amenable number.

9937920661 is a deficient number, since it is larger than the sum of its proper divisors (627745259).

9937920661 is a wasteful number, since it uses less digits than its factorization.

9937920661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8152595.

The product of its (nonzero) digits is 1102248, while the sum is 52.

The square root of 9937920661 is about 99689.1200733560. The cubic root of 9937920661 is about 2149.9672366379.

The spelling of 9937920661 in words is "nine billion, nine hundred thirty-seven million, nine hundred twenty thousand, six hundred sixty-one".