81427300787617 has 16 divisors (see below), whose sum is σ = 87679781380800. Its totient is φ = 75337375144960.

The previous prime is 81427300787501. The next prime is 81427300787641. The reversal of 81427300787617 is 71678700372418.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81427300787617 - 2¹⁹ = 81427300263329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81427300787687) 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, 69406617 + ... + 70570057.

It is an arithmetic number, because the mean of its divisors is an integer number (5479986336300).

Almost surely, 2^{81427300787617} is an apocalyptic number.

It is an amenable number.

81427300787617 is a deficient number, since it is larger than the sum of its proper divisors (6252480593183).

81427300787617 is a wasteful number, since it uses less digits than its factorization.

81427300787617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233296.

The product of its (nonzero) digits is 22127616, while the sum is 61.

The spelling of 81427300787617 in words is "eighty-one trillion, four hundred twenty-seven billion, three hundred million, seven hundred eighty-seven thousand, six hundred seventeen".