665566110642 has 16 divisors (see below), whose sum is σ = 1331140361760. Its totient is φ = 221854013472.

The previous prime is 665566110617. The next prime is 665566110661. The reversal of 665566110642 is 246011665566.

It is a junction number, because it is equal to n+sod(n) for n = 665566110591 and 665566110600.

It is an unprimeable number.

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, 1448334 + ... + 1851702.

It is an arithmetic number, because the mean of its divisors is an integer number (83196272610).

Almost surely, 2^665566110642 is an apocalyptic number.

665566110642 is an abundant number, since it is smaller than the sum of its proper divisors (665574251118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665566110642 is a wasteful number, since it uses less digits than its factorization.

665566110642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678377.

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 665566110642 in words is "six hundred sixty-five billion, five hundred sixty-six million, one hundred ten thousand, six hundred forty-two".