81433767368 has 16 divisors (see below), whose sum is σ = 156412419660. Its totient is φ = 39723788800.

The previous prime is 81433767367. The next prime is 81433767379. The reversal of 81433767368 is 86376733418.

It can be written as a sum of positive squares in 2 ways, for example, as 62769289444 + 18664477924 = 250538^2 + 136618^2 .

It is not an unprimeable number, because it can be changed into a prime (81433767361) 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, 124136513 + ... + 124137168.

Almost surely, 2^81433767368 is an apocalyptic number.

It is an amenable number.

81433767368 is a deficient number, since it is larger than the sum of its proper divisors (74978652292).

81433767368 is a wasteful number, since it uses less digits than its factorization.

81433767368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248273728 (or 248273724 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 56.

The spelling of 81433767368 in words is "eighty-one billion, four hundred thirty-three million, seven hundred sixty-seven thousand, three hundred sixty-eight".