664455705231666 has 32 divisors (see below), whose sum is σ = 1330616081261376. Its totient is φ = 221201150400000.

The previous prime is 664455705231607. The next prime is 664455705231733. The reversal of 664455705231666 is 666132507554466.

It is a junction number, because it is equal to n+sod(n) for n = 664455705231597 and 664455705231606.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94918266 + ... + 101677866.

It is an arithmetic number, because the mean of its divisors is an integer number (41581752539418).

Almost surely, 2^{664455705231666} is an apocalyptic number.

664455705231666 is an abundant number, since it is smaller than the sum of its proper divisors (666160376029710).

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

664455705231666 is a wasteful number, since it uses less digits than its factorization.

664455705231666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6780618.

The product of its (nonzero) digits is 653184000, while the sum is 66.

The spelling of 664455705231666 in words is "six hundred sixty-four trillion, four hundred fifty-five billion, seven hundred five million, two hundred thirty-one thousand, six hundred sixty-six".