81033079965 has 16 divisors (see below), whose sum is σ = 129774922368. Its totient is φ = 43176977856.

The previous prime is 81033079949. The next prime is 81033079997. The reversal of 81033079965 is 56997033018.

It is not a de Polignac number, because 81033079965 - 2⁴ = 81033079949 is a prime.

It is a super-2 number, since 2×81033079965² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2525074 + ... + 2556963.

It is an arithmetic number, because the mean of its divisors is an integer number (8110932648).

Almost surely, 2^81033079965 is an apocalyptic number.

It is an amenable number.

81033079965 is a deficient number, since it is larger than the sum of its proper divisors (48741842403).

81033079965 is a wasteful number, since it uses less digits than its factorization.

81033079965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5083108.

The product of its (nonzero) digits is 1224720, while the sum is 51.

The spelling of 81033079965 in words is "eighty-one billion, thirty-three million, seventy-nine thousand, nine hundred sixty-five".