9923128066 has 4 divisors (see below), whose sum is σ = 14884692102. Its totient is φ = 4961564032.

The previous prime is 9923128051. The next prime is 9923128067. The reversal of 9923128066 is 6608213299.

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

It can be written as a sum of positive squares in only one way, i.e., 7651175841 + 2271952225 = 87471^2 + 47665^2 .

It is a super-2 number, since 2×9923128066² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9923128067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2480782015 + ... + 2480782018.

Almost surely, 2^9923128066 is an apocalyptic number.

9923128066 is a deficient number, since it is larger than the sum of its proper divisors (4961564036).

9923128066 is a wasteful number, since it uses less digits than its factorization.

9923128066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4961564035.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 9923128066 is about 99614.8988153881. The cubic root of 9923128066 is about 2148.8999648338.

The spelling of 9923128066 in words is "nine billion, nine hundred twenty-three million, one hundred twenty-eight thousand, sixty-six".