81705378498 has 16 divisors (see below), whose sum is σ = 163534662720. Its totient is φ = 27214475216.

The previous prime is 81705378493. The next prime is 81705378527. The reversal of 81705378498 is 89487350718.

It is not an unprimeable number, because it can be changed into a prime (81705378493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5154165 + ... + 5169992.

It is an arithmetic number, because the mean of its divisors is an integer number (10220916420).

Almost surely, 2^81705378498 is an apocalyptic number.

81705378498 is an abundant number, since it is smaller than the sum of its proper divisors (81829284222).

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

81705378498 is a wasteful number, since it uses less digits than its factorization.

81705378498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10325481.

The product of its (nonzero) digits is 13547520, while the sum is 60.

The spelling of 81705378498 in words is "eighty-one billion, seven hundred five million, three hundred seventy-eight thousand, four hundred ninety-eight".