81765467433 has 36 divisors (see below), whose sum is σ = 131603422860. Its totient is φ = 48572237952.

The previous prime is 81765467431. The next prime is 81765467453. The reversal of 81765467433 is 33476456718.

It is a happy number.

81765467433 is a `hidden beast` number, since 8 + 176 + 5 + 467 + 4 + 3 + 3 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 19949585049 + 61815882384 = 141243^2 + 248628^2 .

It is not a de Polignac number, because 81765467433 - 2¹ = 81765467431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81765467433.

It is not an unprimeable number, because it can be changed into a prime (81765467431) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16653783 + ... + 16658691.

It is an arithmetic number, because the mean of its divisors is an integer number (3655650635).

Almost surely, 2^81765467433 is an apocalyptic number.

It is an amenable number.

81765467433 is a deficient number, since it is larger than the sum of its proper divisors (49837955427).

81765467433 is an equidigital number, since it uses as much as digits as its factorization.

81765467433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9866 (or 4954 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 54.

The spelling of 81765467433 in words is "eighty-one billion, seven hundred sixty-five million, four hundred sixty-seven thousand, four hundred thirty-three".