4991659581645 has 96 divisors (see below), whose sum is σ = 9652373887104. Its totient is φ = 2365916428800.

The previous prime is 4991659581599. The next prime is 4991659581653. The reversal of 4991659581645 is 5461859561994.

4991659581645 is a `hidden beast` number, since 4 + 9 + 9 + 16 + 595 + 8 + 16 + 4 + 5 = 666.

It is not a de Polignac number, because 4991659581645 - 2⁴¹ = 2792636326093 is a prime.

It is a super-3 number, since 3×4991659581645³ (a number of 39 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4414687 + ... + 5428883.

It is an arithmetic number, because the mean of its divisors is an integer number (100545561324).

Almost surely, 2^{4991659581645} is an apocalyptic number.

4991659581645 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4991659581645 is a deficient number, since it is larger than the sum of its proper divisors (4660714305459).

4991659581645 is a wasteful number, since it uses less digits than its factorization.

4991659581645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014443 (or 1014440 counting only the distinct ones).

The product of its digits is 419904000, while the sum is 72.

The spelling of 4991659581645 in words is "four trillion, nine hundred ninety-one billion, six hundred fifty-nine million, five hundred eighty-one thousand, six hundred forty-five".