28233166657 has 4 divisors (see below), whose sum is σ = 28233647316. Its totient is φ = 28232686000.

The previous prime is 28233166651. The next prime is 28233166667. The reversal of 28233166657 is 75666133282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75666133282 = 2 ⋅37833066641.

It can be written as a sum of positive squares in 2 ways, for example, as 11880128016 + 16353038641 = 108996^2 + 127879^2 .

It is a cyclic number.

It is not a de Polignac number, because 28233166657 - 2⁷ = 28233166529 is a prime.

It is a super-2 number, since 2×28233166657² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28233166657.

It is not an unprimeable number, because it can be changed into a prime (28233166651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137578 + ... + 274579.

It is an arithmetic number, because the mean of its divisors is an integer number (7058411829).

Almost surely, 2^28233166657 is an apocalyptic number.

It is an amenable number.

28233166657 is a deficient number, since it is larger than the sum of its proper divisors (480659).

28233166657 is an equidigital number, since it uses as much as digits as its factorization.

28233166657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480658.

The product of its digits is 2177280, while the sum is 49.

The spelling of 28233166657 in words is "twenty-eight billion, two hundred thirty-three million, one hundred sixty-six thousand, six hundred fifty-seven".