81006633001 has 16 divisors (see below), whose sum is σ = 94631362560. Its totient is φ = 67897573200.

The previous prime is 81006632957. The next prime is 81006633031. The reversal of 81006633001 is 10033660018.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81006633001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81006633031) 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 15 ways as a sum of consecutive naturals, for example, 271720 + ... + 485638.

It is an arithmetic number, because the mean of its divisors is an integer number (5914460160).

Almost surely, 2^81006633001 is an apocalyptic number.

It is an amenable number.

81006633001 is a deficient number, since it is larger than the sum of its proper divisors (13624729559).

81006633001 is a wasteful number, since it uses less digits than its factorization.

81006633001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215124.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 81006633001 in words is "eighty-one billion, six million, six hundred thirty-three thousand, one".