81835424380 has 12 divisors (see below), whose sum is σ = 171854391240. Its totient is φ = 32734169744.

The previous prime is 81835424353. The next prime is 81835424389. The reversal of 81835424380 is 8342453818.

It is a self number, because there is not a number n which added to its sum of digits gives 81835424380.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81835424389) 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, 2045885590 + ... + 2045885629.

It is an arithmetic number, because the mean of its divisors is an integer number (14321199270).

Almost surely, 2^81835424380 is an apocalyptic number.

It is an amenable number.

81835424380 is an abundant number, since it is smaller than the sum of its proper divisors (90018966860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81835424380 is a wasteful number, since it uses less digits than its factorization.

81835424380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4091771228 (or 4091771226 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 46.

The spelling of 81835424380 in words is "eighty-one billion, eight hundred thirty-five million, four hundred twenty-four thousand, three hundred eighty".