81272178582837 has 16 divisors (see below), whose sum is σ = 118215845465088. Its totient is φ = 49255129338480.

The previous prime is 81272178582787. The next prime is 81272178582839. The reversal of 81272178582837 is 73828587127218.

It is not a de Polignac number, because 81272178582837 - 2⁷ = 81272178582709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81272178582839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16167133 + ... + 20589330.

It is an arithmetic number, because the mean of its divisors is an integer number (7388490341568).

Almost surely, 2^{81272178582837} is an apocalyptic number.

It is an amenable number.

81272178582837 is a deficient number, since it is larger than the sum of its proper divisors (36943666882251).

81272178582837 is a wasteful number, since it uses less digits than its factorization.

81272178582837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36823480.

The product of its digits is 168591360, while the sum is 69.

The spelling of 81272178582837 in words is "eighty-one trillion, two hundred seventy-two billion, one hundred seventy-eight million, five hundred eighty-two thousand, eight hundred thirty-seven".