81748884718 has 4 divisors (see below), whose sum is σ = 122623327080. Its totient is φ = 40874442358.

The previous prime is 81748884713. The next prime is 81748884727.

81748884718 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81748884718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81748884713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20437221178 + ... + 20437221181.

It is an arithmetic number, because the mean of its divisors is an integer number (30655831770).

Almost surely, 2^81748884718 is an apocalyptic number.

81748884718 is a deficient number, since it is larger than the sum of its proper divisors (40874442362).

81748884718 is a wasteful number, since it uses less digits than its factorization.

81748884718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40874442361.

The product of its digits is 25690112, while the sum is 64.

The spelling of 81748884718 in words is "eighty-one billion, seven hundred forty-eight million, eight hundred eighty-four thousand, seven hundred eighteen".