81433755337 has 16 divisors (see below), whose sum is σ = 93521937600. Its totient is φ = 70127216640.

The previous prime is 81433755329. The next prime is 81433755353. The reversal of 81433755337 is 73355733418.

It is a cyclic number.

It is not a de Polignac number, because 81433755337 - 2³ = 81433755329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81433755737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3880489 + ... + 3901417.

It is an arithmetic number, because the mean of its divisors is an integer number (5845121100).

Almost surely, 2^81433755337 is an apocalyptic number.

It is an amenable number.

81433755337 is a deficient number, since it is larger than the sum of its proper divisors (12088182263).

81433755337 is a wasteful number, since it uses less digits than its factorization.

81433755337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39576.

The product of its digits is 3175200, while the sum is 49.

The spelling of 81433755337 in words is "eighty-one billion, four hundred thirty-three million, seven hundred fifty-five thousand, three hundred thirty-seven".