81783744037147 has 16 divisors (see below), whose sum is σ = 83362848768000. Its totient is φ = 80218966093344.

The previous prime is 81783744037139. The next prime is 81783744037201. The reversal of 81783744037147 is 74173044738718.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81783744037147 - 2³ = 81783744037139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81783744037117) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 15140754 + ... + 19819432.

It is an arithmetic number, because the mean of its divisors is an integer number (5210178048000).

Almost surely, 2^{81783744037147} is an apocalyptic number.

81783744037147 is a deficient number, since it is larger than the sum of its proper divisors (1579104730853).

81783744037147 is a wasteful number, since it uses less digits than its factorization.

81783744037147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4680210.

The product of its (nonzero) digits is 88510464, while the sum is 64.

The spelling of 81783744037147 in words is "eighty-one trillion, seven hundred eighty-three billion, seven hundred forty-four million, thirty-seven thousand, one hundred forty-seven".