81741790608 has 320 divisors, whose sum is σ = 244245652992. Its totient is φ = 23405690880.

The previous prime is 81741790607. The next prime is 81741790721. The reversal of 81741790608 is 80609714718.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (81741790601) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 36802938 + ... + 36805158.

Almost surely, 2^81741790608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81741790608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122122826496).

81741790608 is an abundant number, since it is smaller than the sum of its proper divisors (162503862384).

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

81741790608 is a wasteful number, since it uses less digits than its factorization.

81741790608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2362 (or 2356 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 51.

The spelling of 81741790608 in words is "eighty-one billion, seven hundred forty-one million, seven hundred ninety thousand, six hundred eight".