81334148074 has 4 divisors (see below), whose sum is σ = 122001222114. Its totient is φ = 40667074036.

The previous prime is 81334148059. The next prime is 81334148089. The reversal of 81334148074 is 47084143318.

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

It is an interprime number because it is at equal distance from previous prime (81334148059) and next prime (81334148089).

It can be written as a sum of positive squares in only one way, i.e., 55011357025 + 26322791049 = 234545^2 + 162243^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81334148074.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20333537017 + ... + 20333537020.

Almost surely, 2^81334148074 is an apocalyptic number.

81334148074 is a deficient number, since it is larger than the sum of its proper divisors (40667074040).

81334148074 is a wasteful number, since it uses less digits than its factorization.

81334148074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40667074039.

The product of its (nonzero) digits is 258048, while the sum is 43.

The spelling of 81334148074 in words is "eighty-one billion, three hundred thirty-four million, one hundred forty-eight thousand, seventy-four".