81475788757418 has 8 divisors (see below), whose sum is σ = 133324017966720. Its totient is φ = 37034449435180.

The previous prime is 81475788757403. The next prime is 81475788757469.

It is a happy number.

81475788757418 is nontrivially palindromic in base 10.

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

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, 1851722471738 + ... + 1851722471781.

It is an arithmetic number, because the mean of its divisors is an integer number (16665502245840).

Almost surely, 2^{81475788757418} is an apocalyptic number.

81475788757418 is a deficient number, since it is larger than the sum of its proper divisors (51848229209302).

81475788757418 is a wasteful number, since it uses less digits than its factorization.

81475788757418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703444943532.

The product of its digits is 3933798400, while the sum is 80.

The spelling of 81475788757418 in words is "eighty-one trillion, four hundred seventy-five billion, seven hundred eighty-eight million, seven hundred fifty-seven thousand, four hundred eighteen".