81850293159 has 32 divisors (see below), whose sum is σ = 115883130816. Its totient is φ = 51210731520.

The previous prime is 81850293149. The next prime is 81850293197. The reversal of 81850293159 is 95139205818.

It is not a de Polignac number, because 81850293159 - 2¹⁷ = 81850162087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81850293139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37875039 + ... + 37877199.

It is an arithmetic number, because the mean of its divisors is an integer number (3621347838).

Almost surely, 2^81850293159 is an apocalyptic number.

81850293159 is a deficient number, since it is larger than the sum of its proper divisors (34032837657).

81850293159 is a wasteful number, since it uses less digits than its factorization.

81850293159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3955.

The product of its (nonzero) digits is 777600, while the sum is 51.

The spelling of 81850293159 in words is "eighty-one billion, eight hundred fifty million, two hundred ninety-three thousand, one hundred fifty-nine".