81768086718 has 64 divisors (see below), whose sum is σ = 176148940032. Its totient is φ = 25210068480.

The previous prime is 81768086711. The next prime is 81768086753.

81768086718 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81768086711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7977705 + ... + 7987947.

It is an arithmetic number, because the mean of its divisors is an integer number (2752327188).

Almost surely, 2^81768086718 is an apocalyptic number.

81768086718 is an abundant number, since it is smaller than the sum of its proper divisors (94380853314).

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

81768086718 is a wasteful number, since it uses less digits than its factorization.

81768086718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11609.

The product of its (nonzero) digits is 7225344, while the sum is 60.

The spelling of 81768086718 in words is "eighty-one billion, seven hundred sixty-eight million, eighty-six thousand, seven hundred eighteen".