81333026769 has 4 divisors (see below), whose sum is σ = 108444035696. Its totient is φ = 54222017844.

The previous prime is 81333026767. The next prime is 81333026773. The reversal of 81333026769 is 96762033318.

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 not a de Polignac number, because 81333026769 - 2¹ = 81333026767 is a prime.

It is a super-2 number, since 2×81333026769² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81333026767) 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, 13555504459 + ... + 13555504464.

It is an arithmetic number, because the mean of its divisors is an integer number (27111008924).

Almost surely, 2^81333026769 is an apocalyptic number.

It is an amenable number.

81333026769 is a deficient number, since it is larger than the sum of its proper divisors (27111008927).

81333026769 is a wasteful number, since it uses less digits than its factorization.

81333026769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27111008926.

The product of its (nonzero) digits is 979776, while the sum is 48.

The spelling of 81333026769 in words is "eighty-one billion, three hundred thirty-three million, twenty-six thousand, seven hundred sixty-nine".