81498207604 has 24 divisors (see below), whose sum is σ = 164739693888. Its totient is φ = 34865543040.

The previous prime is 81498207577. The next prime is 81498207611. The reversal of 81498207604 is 40670289418.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54476664 + ... + 54478159.

It is an arithmetic number, because the mean of its divisors is an integer number (6864153912).

Almost surely, 2^81498207604 is an apocalyptic number.

It is an amenable number.

81498207604 is an abundant number, since it is smaller than the sum of its proper divisors (83241486284).

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

81498207604 is a wasteful number, since it uses less digits than its factorization.

81498207604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108954855 (or 108954853 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 81498207604 in words is "eighty-one billion, four hundred ninety-eight million, two hundred seven thousand, six hundred four".