80136444305691 has 12 divisors (see below), whose sum is σ = 115875652033440. Its totient is φ = 53367522238320.

The previous prime is 80136444305689. The next prime is 80136444305773. The reversal of 80136444305691 is 19650344463108.

It is a happy number.

80136444305691 is a `hidden beast` number, since 8 + 0 + 1 + 3 + 6 + 4 + 44 + 30 + 569 + 1 = 666.

It is not a de Polignac number, because 80136444305691 - 2¹ = 80136444305689 is a prime.

It is a super-3 number, since 3×80136444305691³ (a number of 43 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (80136444305191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4731154851 + ... + 4731171788.

It is an arithmetic number, because the mean of its divisors is an integer number (9656304336120).

Almost surely, 2^{80136444305691} is an apocalyptic number.

80136444305691 is a deficient number, since it is larger than the sum of its proper divisors (35739207727749).

80136444305691 is a wasteful number, since it uses less digits than its factorization.

80136444305691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9462327586 (or 9462327583 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 54.

Adding to 80136444305691 its reverse (19650344463108), we get a palindrome (99786788768799).

The spelling of 80136444305691 in words is "eighty trillion, one hundred thirty-six billion, four hundred forty-four million, three hundred five thousand, six hundred ninety-one".