81516667432 has 32 divisors (see below), whose sum is σ = 153457178400. Its totient is φ = 40595062464.

The previous prime is 81516667403. The next prime is 81516667439. The reversal of 81516667432 is 23476661518.

It is not an unprimeable number, because it can be changed into a prime (81516667439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2150419 + ... + 2187997.

It is an arithmetic number, because the mean of its divisors is an integer number (4795536825).

Almost surely, 2^81516667432 is an apocalyptic number.

It is an amenable number.

81516667432 is a deficient number, since it is larger than the sum of its proper divisors (71940510968).

81516667432 is a wasteful number, since it uses less digits than its factorization.

81516667432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38665 (or 38661 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 49.

The spelling of 81516667432 in words is "eighty-one billion, five hundred sixteen million, six hundred sixty-seven thousand, four hundred thirty-two".