81333732406 has 16 divisors (see below), whose sum is σ = 122186854080. Its totient is φ = 40604811840.

The previous prime is 81333732401. The next prime is 81333732433. The reversal of 81333732406 is 60423733318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81333732401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9025555 + ... + 9034561.

It is an arithmetic number, because the mean of its divisors is an integer number (7636678380).

Almost surely, 2^81333732406 is an apocalyptic number.

81333732406 is a deficient number, since it is larger than the sum of its proper divisors (40853121674).

81333732406 is a wasteful number, since it uses less digits than its factorization.

81333732406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15399.

The product of its (nonzero) digits is 217728, while the sum is 40.

The spelling of 81333732406 in words is "eighty-one billion, three hundred thirty-three million, seven hundred thirty-two thousand, four hundred six".