81368498424 has 16 divisors (see below), whose sum is σ = 203421246120. Its totient is φ = 27122832800.

The previous prime is 81368498417. The next prime is 81368498429. The reversal of 81368498424 is 42489486318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81368498429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1695177027 + ... + 1695177074.

Almost surely, 2^81368498424 is an apocalyptic number.

It is an amenable number.

81368498424 is an abundant number, since it is smaller than the sum of its proper divisors (122052747696).

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

81368498424 is a wasteful number, since it uses less digits than its factorization.

81368498424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3390354110 (or 3390354106 counting only the distinct ones).

The product of its digits is 10616832, while the sum is 57.

The spelling of 81368498424 in words is "eighty-one billion, three hundred sixty-eight million, four hundred ninety-eight thousand, four hundred twenty-four".