81749494718 has 8 divisors (see below), whose sum is σ = 122669482320. Its totient is φ = 40859667280.

The previous prime is 81749494691. The next prime is 81749494721.

81749494718 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7533263 + ... + 7544106.

It is an arithmetic number, because the mean of its divisors is an integer number (15333685290).

Almost surely, 2^81749494718 is an apocalyptic number.

81749494718 is a deficient number, since it is larger than the sum of its proper divisors (40919987602).

81749494718 is a wasteful number, since it uses less digits than its factorization.

81749494718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15080082.

The product of its digits is 16257024, while the sum is 62.

The spelling of 81749494718 in words is "eighty-one billion, seven hundred forty-nine million, four hundred ninety-four thousand, seven hundred eighteen".