81598938036 has 96 divisors (see below), whose sum is σ = 245564282880. Its totient is φ = 20463676800.

The previous prime is 81598938023. The next prime is 81598938059. The reversal of 81598938036 is 63083989518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1495800 + ... + 1549391.

It is an arithmetic number, because the mean of its divisors is an integer number (2557961280).

Almost surely, 2^81598938036 is an apocalyptic number.

It is an amenable number.

81598938036 is an abundant number, since it is smaller than the sum of its proper divisors (163965344844).

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

81598938036 is a wasteful number, since it uses less digits than its factorization.

81598938036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045245 (or 3045243 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 60.

The spelling of 81598938036 in words is "eighty-one billion, five hundred ninety-eight million, nine hundred thirty-eight thousand, thirty-six".