81246398008511 has 12 divisors (see below), whose sum is σ = 83190761905680. Its totient is φ = 79346479101120.

The previous prime is 81246398008481. The next prime is 81246398008519. The reversal of 81246398008511 is 11580089364218.

It is a de Polignac number, because none of the positive numbers 2^k-81246398008511 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 (81246398008519) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11141495 + ... + 16930023.

It is an arithmetic number, because the mean of its divisors is an integer number (6932563492140).

Almost surely, 2^{81246398008511} is an apocalyptic number.

81246398008511 is a deficient number, since it is larger than the sum of its proper divisors (1944363897169).

81246398008511 is an equidigital number, since it uses as much as digits as its factorization.

81246398008511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5796206 (or 5796163 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 56.

The spelling of 81246398008511 in words is "eighty-one trillion, two hundred forty-six billion, three hundred ninety-eight million, eight thousand, five hundred eleven".