81335869692 has 288 divisors, whose sum is σ = 249842589696. Its totient is φ = 20343254400.

The previous prime is 81335869621. The next prime is 81335869697. The reversal of 81335869692 is 29696853318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81335869697) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 45514423 + ... + 45516209.

It is an arithmetic number, because the mean of its divisors is an integer number (867508992).

Almost surely, 2^81335869692 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81335869692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124921294848).

81335869692 is an abundant number, since it is smaller than the sum of its proper divisors (168506720004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81335869692 is a wasteful number, since it uses less digits than its factorization.

81335869692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2077 (or 2068 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 60.

The spelling of 81335869692 in words is "eighty-one billion, three hundred thirty-five million, eight hundred sixty-nine thousand, six hundred ninety-two".