81443032637 has 8 divisors (see below), whose sum is σ = 85004665920. Its totient is φ = 77883118720.

The previous prime is 81443032603. The next prime is 81443032669. The reversal of 81443032637 is 73623034418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81443032637 - 2²⁰ = 81441984061 is a prime.

It is a super-2 number, since 2×81443032637² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81443032594 and 81443032603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81443032837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332564 + ... + 522957.

It is an arithmetic number, because the mean of its divisors is an integer number (10625583240).

Almost surely, 2^81443032637 is an apocalyptic number.

It is an amenable number.

81443032637 is a deficient number, since it is larger than the sum of its proper divisors (3561633283).

81443032637 is a wasteful number, since it uses less digits than its factorization.

81443032637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859683.

The product of its (nonzero) digits is 290304, while the sum is 41.

The spelling of 81443032637 in words is "eighty-one billion, four hundred forty-three million, thirty-two thousand, six hundred thirty-seven".