11166728445 has 24 divisors (see below), whose sum is σ = 20072541216. Its totient is φ = 5955587856.

The previous prime is 11166728401. The next prime is 11166728453. The reversal of 11166728445 is 54482766111.

It is not a de Polignac number, because 11166728445 - 2⁸ = 11166728189 is a prime.

It is a super-3 number, since 3×11166728445³ (a number of 31 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 11166728445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4594147 + ... + 4596576.

It is an arithmetic number, because the mean of its divisors is an integer number (836355884).

Almost surely, 2^11166728445 is an apocalyptic number.

11166728445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11166728445 is a deficient number, since it is larger than the sum of its proper divisors (8905812771).

11166728445 is an frugal number, since it uses more digits than its factorization.

11166728445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9190743 (or 9190731 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The spelling of 11166728445 in words is "eleven billion, one hundred sixty-six million, seven hundred twenty-eight thousand, four hundred forty-five".