81003326169599 has 16 divisors (see below), whose sum is σ = 82238974384320. Its totient is φ = 79771108435200.

The previous prime is 81003326169583. The next prime is 81003326169617. The reversal of 81003326169599 is 99596162330018.

It is a cyclic number.

It is not a de Polignac number, because 81003326169599 - 2⁴ = 81003326169583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81003326169509) 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, 502898894 + ... + 503059940.

It is an arithmetic number, because the mean of its divisors is an integer number (5139935899020).

Almost surely, 2^{81003326169599} is an apocalyptic number.

81003326169599 is a deficient number, since it is larger than the sum of its proper divisors (1235648214721).

81003326169599 is a wasteful number, since it uses less digits than its factorization.

81003326169599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171650.

The product of its (nonzero) digits is 18895680, while the sum is 62.

The spelling of 81003326169599 in words is "eighty-one trillion, three billion, three hundred twenty-six million, one hundred sixty-nine thousand, five hundred ninety-nine".