81739694448 has 30 divisors (see below), whose sum is σ = 228757617504. Its totient is φ = 27246564768.

The previous prime is 81739694429. The next prime is 81739694467. The reversal of 81739694448 is 84449693718.

81739694448 is a `hidden beast` number, since 8 + 17 + 3 + 96 + 94 + 448 = 666.

It is an interprime number because it is at equal distance from previous prime (81739694429) and next prime (81739694467).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 283818240 + ... + 283818527.

Almost surely, 2^81739694448 is an apocalyptic number.

It is an amenable number.

81739694448 is an abundant number, since it is smaller than the sum of its proper divisors (147017923056).

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

81739694448 is a wasteful number, since it uses less digits than its factorization.

81739694448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567636781 (or 567636772 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 63.

The spelling of 81739694448 in words is "eighty-one billion, seven hundred thirty-nine million, six hundred ninety-four thousand, four hundred forty-eight".