1566550566551 has 8 divisors (see below), whose sum is σ = 1593309223440. Its totient is φ = 1539995397952.

The previous prime is 1566550566541. The next prime is 1566550566589. The reversal of 1566550566551 is 1556650556651.

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

It is a cyclic number.

It is not a de Polignac number, because 1566550566551 - 2⁶ = 1566550566487 is a prime.

It is a super-3 number, since 3×1566550566551³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566550566541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50856545 + ... + 50887338.

It is an arithmetic number, because the mean of its divisors is an integer number (199163652930).

Almost surely, 2^{1566550566551} is an apocalyptic number.

1566550566551 is a deficient number, since it is larger than the sum of its proper divisors (26758656889).

1566550566551 is a wasteful number, since it uses less digits than its factorization.

1566550566551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101744145.

The product of its (nonzero) digits is 20250000, while the sum is 56.

The spelling of 1566550566551 in words is "one trillion, five hundred sixty-six billion, five hundred fifty million, five hundred sixty-six thousand, five hundred fifty-one".