81598886478 has 48 divisors (see below), whose sum is σ = 177250451040. Its totient is φ = 27130042368.

The previous prime is 81598886477. The next prime is 81598886513. The reversal of 81598886478 is 87468889518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81598886471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16687858 + ... + 16692746.

It is an arithmetic number, because the mean of its divisors is an integer number (3692717730).

Almost surely, 2^81598886478 is an apocalyptic number.

81598886478 is an abundant number, since it is smaller than the sum of its proper divisors (95651564562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81598886478 is a wasteful number, since it uses less digits than its factorization.

81598886478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7081 (or 7078 counting only the distinct ones).

The product of its digits is 247726080, while the sum is 72.

The spelling of 81598886478 in words is "eighty-one billion, five hundred ninety-eight million, eight hundred eighty-six thousand, four hundred seventy-eight".