28651566001 has 4 divisors (see below), whose sum is σ = 28663849332. Its totient is φ = 28639282672.

The previous prime is 28651565959. The next prime is 28651566019. The reversal of 28651566001 is 10066515682.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17702036401 + 10949529600 = 133049^2 + 104640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28651566001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28651576001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6138166 + ... + 6142831.

It is an arithmetic number, because the mean of its divisors is an integer number (7165962333).

Almost surely, 2^28651566001 is an apocalyptic number.

It is an amenable number.

28651566001 is a deficient number, since it is larger than the sum of its proper divisors (12283331).

28651566001 is a wasteful number, since it uses less digits than its factorization.

28651566001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12283330.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 28651566001 in words is "twenty-eight billion, six hundred fifty-one million, five hundred sixty-six thousand, one".