81998885295740 has 48 divisors (see below), whose sum is σ = 196833642700800. Its totient is φ = 28108715245632.

The previous prime is 81998885295713. The next prime is 81998885295763. The reversal of 81998885295740 is 4759258889918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53283260 + ... + 54800579.

It is an arithmetic number, because the mean of its divisors is an integer number (4100700889600).

Almost surely, 2^{81998885295740} is an apocalyptic number.

It is an amenable number.

81998885295740 is an abundant number, since it is smaller than the sum of its proper divisors (114834757405060).

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

81998885295740 is a wasteful number, since it uses less digits than its factorization.

81998885295740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108089274 (or 108089272 counting only the distinct ones).

The product of its (nonzero) digits is 4180377600, while the sum is 83.

The spelling of 81998885295740 in words is "eighty-one trillion, nine hundred ninety-eight billion, eight hundred eighty-five million, two hundred ninety-five thousand, seven hundred forty".