81741854208 has 160 divisors (see below), whose sum is σ = 253572270336. Its totient is φ = 22913998848.

The previous prime is 81741854197. The next prime is 81741854213. The reversal of 81741854208 is 80245814718.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 498135 + ... + 641577.

Almost surely, 2^81741854208 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 81741854208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126786135168).

81741854208 is an abundant number, since it is smaller than the sum of its proper divisors (171830416128).

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

81741854208 is a wasteful number, since it uses less digits than its factorization.

81741854208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143524 (or 143508 counting only the distinct ones).

The product of its (nonzero) digits is 573440, while the sum is 48.

The spelling of 81741854208 in words is "eighty-one billion, seven hundred forty-one million, eight hundred fifty-four thousand, two hundred eight".