81805858270 has 16 divisors (see below), whose sum is σ = 155912341968. Its totient is φ = 30797499520.

The previous prime is 81805858259. The next prime is 81805858279. The reversal of 81805858270 is 7285850818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81805858279) 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, 240605296 + ... + 240605635.

It is an arithmetic number, because the mean of its divisors is an integer number (9744521373).

Almost surely, 2^81805858270 is an apocalyptic number.

81805858270 is a deficient number, since it is larger than the sum of its proper divisors (74106483698).

81805858270 is a wasteful number, since it uses less digits than its factorization.

81805858270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481210955.

The product of its (nonzero) digits is 1433600, while the sum is 52.

The spelling of 81805858270 in words is "eighty-one billion, eight hundred five million, eight hundred fifty-eight thousand, two hundred seventy".