81003326169601 has 32 divisors (see below), whose sum is σ = 90247346638848. Its totient is φ = 72086639264640.

The previous prime is 81003326169583. The next prime is 81003326169617. The reversal of 81003326169601 is 10696162330018.

It is not a de Polignac number, because 81003326169601 - 2¹³ = 81003326161409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81003326139601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 470444941 + ... + 470617093.

It is an arithmetic number, because the mean of its divisors is an integer number (2820229582464).

Almost surely, 2^{81003326169601} is an apocalyptic number.

It is an amenable number.

81003326169601 is a deficient number, since it is larger than the sum of its proper divisors (9244020469247).

81003326169601 is a wasteful number, since it uses less digits than its factorization.

81003326169601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176221.

The product of its (nonzero) digits is 279936, while the sum is 46.

Adding to 81003326169601 its reverse (10696162330018), we get a palindrome (91699488499619).

The spelling of 81003326169601 in words is "eighty-one trillion, three billion, three hundred twenty-six million, one hundred sixty-nine thousand, six hundred one".