164277591985 has 8 divisors (see below), whose sum is σ = 212297195880. Its totient is φ = 121312683264.

The previous prime is 164277591967. The next prime is 164277592001. The reversal of 164277591985 is 589195772461.

It can be written as a sum of positive squares in 4 ways, for example, as 10198576144 + 154079015841 = 100988^2 + 392529^2 .

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 164277591985 - 2⁵ = 164277591953 is a prime.

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, 1263673720 + ... + 1263673849.

It is an arithmetic number, because the mean of its divisors is an integer number (26537149485).

Almost surely, 2^164277591985 is an apocalyptic number.

It is an amenable number.

164277591985 is a deficient number, since it is larger than the sum of its proper divisors (48019603895).

164277591985 is a wasteful number, since it uses less digits than its factorization.

164277591985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527347587.

The product of its digits is 38102400, while the sum is 64.

The spelling of 164277591985 in words is "one hundred sixty-four billion, two hundred seventy-seven million, five hundred ninety-one thousand, nine hundred eighty-five".