81738571283 has 4 divisors (see below), whose sum is σ = 81752652960. Its totient is φ = 81724489608.

The previous prime is 81738571279. The next prime is 81738571297. The reversal of 81738571283 is 38217583718.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81738571283 - 2² = 81738571279 is a prime.

It is a super-3 number, since 3×81738571283³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81738571253) 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, 7032128 + ... + 7043741.

It is an arithmetic number, because the mean of its divisors is an integer number (20438163240).

Almost surely, 2^81738571283 is an apocalyptic number.

81738571283 is a deficient number, since it is larger than the sum of its proper divisors (14081677).

81738571283 is a wasteful number, since it uses less digits than its factorization.

81738571283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14081676.

The product of its digits is 2257920, while the sum is 53.

The spelling of 81738571283 in words is "eighty-one billion, seven hundred thirty-eight million, five hundred seventy-one thousand, two hundred eighty-three".