28137583671566 has 4 divisors (see below), whose sum is σ = 42206375507352. Its totient is φ = 14068791835782.

The previous prime is 28137583671541. The next prime is 28137583671583. The reversal of 28137583671566 is 66517638573182.

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

It is a super-2 number, since 2×28137583671566² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28137583671496 and 28137583671505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7034395917890 + ... + 7034395917893.

It is an arithmetic number, because the mean of its divisors is an integer number (10551593876838).

Almost surely, 2^{28137583671566} is an apocalyptic number.

28137583671566 is a deficient number, since it is larger than the sum of its proper divisors (14068791835786).

28137583671566 is a wasteful number, since it uses less digits than its factorization.

28137583671566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14068791835785.

The product of its digits is 304819200, while the sum is 68.

The spelling of 28137583671566 in words is "twenty-eight trillion, one hundred thirty-seven billion, five hundred eighty-three million, six hundred seventy-one thousand, five hundred sixty-six".