81708550424 has 16 divisors (see below), whose sum is σ = 153208837320. Its totient is φ = 40852860480.

The previous prime is 81708550411. The next prime is 81708550453. The reversal of 81708550424 is 42405580718.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

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, 92804 + ... + 414764.

Almost surely, 2^81708550424 is an apocalyptic number.

It is an amenable number.

81708550424 is a deficient number, since it is larger than the sum of its proper divisors (71500286896).

81708550424 is a wasteful number, since it uses less digits than its factorization.

81708550424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353690 (or 353686 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 44.

The spelling of 81708550424 in words is "eighty-one billion, seven hundred eight million, five hundred fifty thousand, four hundred twenty-four".