81437442210 has 48 divisors (see below), whose sum is σ = 211812130296. Its totient is φ = 21708981504.

The previous prime is 81437442197. The next prime is 81437442217. The reversal of 81437442210 is 1224473418.

81437442210 is a `hidden beast` number, since 8 + 1 + 437 + 4 + 4 + 2 + 210 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 79393769361 + 2043672849 = 281769^2 + 45207^2 .

It is not an unprimeable number, because it can be changed into a prime (81437442217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98772 + ... + 415488.

Almost surely, 2^81437442210 is an apocalyptic number.

81437442210 is an abundant number, since it is smaller than the sum of its proper divisors (130374688086).

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

81437442210 is a wasteful number, since it uses less digits than its factorization.

81437442210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319587 (or 319584 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The spelling of 81437442210 in words is "eighty-one billion, four hundred thirty-seven million, four hundred forty-two thousand, two hundred ten".