81598832144 has 20 divisors (see below), whose sum is σ = 166418671440. Its totient is φ = 38652078240.

The previous prime is 81598832131. The next prime is 81598832173. The reversal of 81598832144 is 44123889518.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134208302 + ... + 134208909.

It is an arithmetic number, because the mean of its divisors is an integer number (8320933572).

Almost surely, 2^81598832144 is an apocalyptic number.

It is an amenable number.

81598832144 is an abundant number, since it is smaller than the sum of its proper divisors (84819839296).

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

81598832144 is a wasteful number, since it uses less digits than its factorization.

81598832144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268417238 (or 268417232 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 53.

The spelling of 81598832144 in words is "eighty-one billion, five hundred ninety-eight million, eight hundred thirty-two thousand, one hundred forty-four".