1665677516854 has 16 divisors (see below), whose sum is σ = 2693979261792. Its totient is φ = 767840116608.

The previous prime is 1665677516843. The next prime is 1665677516981. The reversal of 1665677516854 is 4586157765661.

It is a self number, because there is not a number n which added to its sum of digits gives 1665677516854.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38899939 + ... + 38942734.

It is an arithmetic number, because the mean of its divisors is an integer number (168373703862).

Almost surely, 2^{1665677516854} is an apocalyptic number.

1665677516854 is a deficient number, since it is larger than the sum of its proper divisors (1028301744938).

1665677516854 is a wasteful number, since it uses less digits than its factorization.

1665677516854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77843511.

The product of its digits is 254016000, while the sum is 67.

The spelling of 1665677516854 in words is "one trillion, six hundred sixty-five billion, six hundred seventy-seven million, five hundred sixteen thousand, eight hundred fifty-four".