81959696132 has 48 divisors (see below), whose sum is σ = 153887973120. Its totient is φ = 38056512000.

The previous prime is 81959696129. The next prime is 81959696153. The reversal of 81959696132 is 23169695918.

It is a super-2 number, since 2×81959696132² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 10369382 + ... + 10377282.

It is an arithmetic number, because the mean of its divisors is an integer number (3205999440).

Almost surely, 2^81959696132 is an apocalyptic number.

It is an amenable number.

81959696132 is a deficient number, since it is larger than the sum of its proper divisors (71928276988).

81959696132 is a wasteful number, since it uses less digits than its factorization.

81959696132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9932 (or 9930 counting only the distinct ones).

The product of its digits is 6298560, while the sum is 59.

The spelling of 81959696132 in words is "eighty-one billion, nine hundred fifty-nine million, six hundred ninety-six thousand, one hundred thirty-two".