81068359669 has 4 divisors (see below), whose sum is σ = 88438210560. Its totient is φ = 73698508780.

The previous prime is 81068359667. The next prime is 81068359679. The reversal of 81068359669 is 96695386018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81068359669 - 2¹ = 81068359667 is a prime.

It is a super-2 number, since 2×81068359669² (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 (81068359661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3684925429 + ... + 3684925450.

It is an arithmetic number, because the mean of its divisors is an integer number (22109552640).

Almost surely, 2^81068359669 is an apocalyptic number.

It is an amenable number.

81068359669 is a deficient number, since it is larger than the sum of its proper divisors (7369850891).

81068359669 is a wasteful number, since it uses less digits than its factorization.

81068359669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7369850890.

The product of its (nonzero) digits is 16796160, while the sum is 61.

The spelling of 81068359669 in words is "eighty-one billion, sixty-eight million, three hundred fifty-nine thousand, six hundred sixty-nine".