81607920033 has 16 divisors (see below), whose sum is σ = 109564076160. Its totient is φ = 54028905216.

The previous prime is 81607920007. The next prime is 81607920041. The reversal of 81607920033 is 33002970618.

It is not a de Polignac number, because 81607920033 - 2¹⁴ = 81607903649 is a prime.

It is a super-2 number, since 2×81607920033² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81607919973 and 81607920000.

It is not an unprimeable number, because it can be changed into a prime (81607920083) 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, 823033 + ... + 916841.

It is an arithmetic number, because the mean of its divisors is an integer number (6847754760).

Almost surely, 2^81607920033 is an apocalyptic number.

It is an amenable number.

81607920033 is a deficient number, since it is larger than the sum of its proper divisors (27956156127).

81607920033 is a wasteful number, since it uses less digits than its factorization.

81607920033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95816.

The product of its (nonzero) digits is 54432, while the sum is 39.

The spelling of 81607920033 in words is "eighty-one billion, six hundred seven million, nine hundred twenty thousand, thirty-three".