81966435532 has 12 divisors (see below), whose sum is σ = 145406211496. Its totient is φ = 40421803680.

The previous prime is 81966435517. The next prime is 81966435533. The reversal of 81966435532 is 23553466918.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81966435532.

It is not an unprimeable number, because it can be changed into a prime (81966435533) 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, 140353194 + ... + 140353777.

Almost surely, 2^81966435532 is an apocalyptic number.

It is an amenable number.

81966435532 is a deficient number, since it is larger than the sum of its proper divisors (63439775964).

81966435532 is a wasteful number, since it uses less digits than its factorization.

81966435532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280707048 (or 280707046 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 52.

The spelling of 81966435532 in words is "eighty-one billion, nine hundred sixty-six million, four hundred thirty-five thousand, five hundred thirty-two".