81847392359039 has 8 divisors (see below), whose sum is σ = 86155280774640. Its totient is φ = 77539517035776.

The previous prime is 81847392359011. The next prime is 81847392359071. The reversal of 81847392359039 is 93095329374818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81847392359039 - 2⁸ = 81847392358783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81847392359009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11200079 + ... + 17004015.

It is an arithmetic number, because the mean of its divisors is an integer number (10769410096830).

Almost surely, 2^{81847392359039} is an apocalyptic number.

81847392359039 is a deficient number, since it is larger than the sum of its proper divisors (4307888415601).

81847392359039 is a wasteful number, since it uses less digits than its factorization.

81847392359039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6546169.

The product of its (nonzero) digits is 352719360, while the sum is 71.

The spelling of 81847392359039 in words is "eighty-one trillion, eight hundred forty-seven billion, three hundred ninety-two million, three hundred fifty-nine thousand, thirty-nine".