81450877847 has 8 divisors (see below), whose sum is σ = 83190240000. Its totient is φ = 79711780984.

The previous prime is 81450877843. The next prime is 81450877889. The reversal of 81450877847 is 74877805418.

It is a happy number.

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 81450877847 - 2² = 81450877843 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81450877843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 631904 + ... + 749802.

It is an arithmetic number, because the mean of its divisors is an integer number (10398780000).

Almost surely, 2^81450877847 is an apocalyptic number.

81450877847 is a deficient number, since it is larger than the sum of its proper divisors (1739362153).

81450877847 is a wasteful number, since it uses less digits than its factorization.

81450877847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132645.

The product of its (nonzero) digits is 14049280, while the sum is 59.

The spelling of 81450877847 in words is "eighty-one billion, four hundred fifty million, eight hundred seventy-seven thousand, eight hundred forty-seven".