1566168616651 has 4 divisors (see below), whose sum is σ = 1566181475704. Its totient is φ = 1566155757600.

The previous prime is 1566168616637. The next prime is 1566168616657.

1566168616651 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 1566168616651 - 2²⁷ = 1566034398923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1566168616657) 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 3 ways as a sum of consecutive naturals, for example, 6245070 + ... + 6491011.

It is an arithmetic number, because the mean of its divisors is an integer number (391545368926).

Almost surely, 2^{1566168616651} is an apocalyptic number.

1566168616651 is a deficient number, since it is larger than the sum of its proper divisors (12859053).

1566168616651 is a wasteful number, since it uses less digits than its factorization.

1566168616651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12859052.

The product of its digits is 9331200, while the sum is 58.

The spelling of 1566168616651 in words is "one trillion, five hundred sixty-six billion, one hundred sixty-eight million, six hundred sixteen thousand, six hundred fifty-one".