28666132112057 has 4 divisors (see below), whose sum is σ = 31272144122256. Its totient is φ = 26060120101860.

The previous prime is 28666132112041. The next prime is 28666132112099. The reversal of 28666132112057 is 75021123166682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28666132112057 - 2⁴ = 28666132112041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28666132111996 and 28666132112014.

It is not an unprimeable number, because it can be changed into a prime (28666132112027) 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, 1303006005083 + ... + 1303006005104.

It is an arithmetic number, because the mean of its divisors is an integer number (7818036030564).

Almost surely, 2^{28666132112057} is an apocalyptic number.

It is an amenable number.

28666132112057 is a deficient number, since it is larger than the sum of its proper divisors (2606012010199).

28666132112057 is a wasteful number, since it uses less digits than its factorization.

28666132112057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606012010198.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 28666132112057 in words is "twenty-eight trillion, six hundred sixty-six billion, one hundred thirty-two million, one hundred twelve thousand, fifty-seven".