28166940503999 has 8 divisors (see below), whose sum is σ = 30948633125760. Its totient is φ = 25422091493400.

The previous prime is 28166940503971. The next prime is 28166940504089. The reversal of 28166940503999 is 99930504966182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28166940503999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28166940703999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9210901187 + ... + 9210904244.

It is an arithmetic number, because the mean of its divisors is an integer number (3868579140720).

Almost surely, 2^{28166940503999} is an apocalyptic number.

28166940503999 is a deficient number, since it is larger than the sum of its proper divisors (2781692621761).

28166940503999 is a wasteful number, since it uses less digits than its factorization.

28166940503999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18421805581.

The product of its (nonzero) digits is 226748160, while the sum is 71.

The spelling of 28166940503999 in words is "twenty-eight trillion, one hundred sixty-six billion, nine hundred forty million, five hundred three thousand, nine hundred ninety-nine".