81764246718 has 128 divisors (see below), whose sum is σ = 226727424000. Its totient is φ = 21219239520.

The previous prime is 81764246717. The next prime is 81764246731.

81764246718 is a `hidden beast` number, since 8 + 176 + 4 + 2 + 467 + 1 + 8 = 666.

81764246718 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81764246717) 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, 5227113 + ... + 5242731.

It is an arithmetic number, because the mean of its divisors is an integer number (1771308000).

Almost surely, 2^81764246718 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81764246718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113363712000).

81764246718 is an abundant number, since it is smaller than the sum of its proper divisors (144963177282).

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

81764246718 is a wasteful number, since it uses less digits than its factorization.

81764246718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16907 (or 16901 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The spelling of 81764246718 in words is "eighty-one billion, seven hundred sixty-four million, two hundred forty-six thousand, seven hundred eighteen".