81885747335 has 16 divisors (see below), whose sum is σ = 113882153472. Its totient is φ = 55359376800.

The previous prime is 81885747331. The next prime is 81885747337. The reversal of 81885747335 is 53374758818.

It is not a de Polignac number, because 81885747335 - 2² = 81885747331 is a prime.

It is a super-2 number, since 2×81885747335² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81885747331) 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, 16473521 + ... + 16478490.

It is an arithmetic number, because the mean of its divisors is an integer number (7117634592).

Almost surely, 2^81885747335 is an apocalyptic number.

81885747335 is a deficient number, since it is larger than the sum of its proper divisors (31996406137).

81885747335 is a wasteful number, since it uses less digits than its factorization.

81885747335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32952094.

The product of its digits is 22579200, while the sum is 59.

The spelling of 81885747335 in words is "eighty-one billion, eight hundred eighty-five million, seven hundred forty-seven thousand, three hundred thirty-five".