9966255428 has 24 divisors (see below), whose sum is σ = 17730585600. Its totient is φ = 4900866048.

The previous prime is 9966255353. The next prime is 9966255451. The reversal of 9966255428 is 8245526699.

It is a super-2 number, since 2×9966255428² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

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, 19853 + ... + 142571.

It is an arithmetic number, because the mean of its divisors is an integer number (738774400).

Almost surely, 2^9966255428 is an apocalyptic number.

It is an amenable number.

9966255428 is a deficient number, since it is larger than the sum of its proper divisors (7764330172).

9966255428 is a wasteful number, since it uses less digits than its factorization.

9966255428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123059 (or 123057 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 56.

The square root of 9966255428 is about 99831.1345623198. The cubic root of 9966255428 is about 2152.0086098636.

The spelling of 9966255428 in words is "nine billion, nine hundred sixty-six million, two hundred fifty-five thousand, four hundred twenty-eight".