81351696633 has 16 divisors (see below), whose sum is σ = 109117805376. Its totient is φ = 53910152640.

The previous prime is 81351696581. The next prime is 81351696637. The reversal of 81351696633 is 33669615318.

It is not a de Polignac number, because 81351696633 - 2⁹ = 81351696121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81351696637) 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, 3210891 + ... + 3236127.

It is an arithmetic number, because the mean of its divisors is an integer number (6819862836).

Almost surely, 2^81351696633 is an apocalyptic number.

It is an amenable number.

81351696633 is a deficient number, since it is larger than the sum of its proper divisors (27766108743).

81351696633 is a wasteful number, since it uses less digits than its factorization.

81351696633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31624.

The product of its digits is 2099520, while the sum is 51.

The spelling of 81351696633 in words is "eighty-one billion, three hundred fifty-one million, six hundred ninety-six thousand, six hundred thirty-three".