81470118285 has 24 divisors (see below), whose sum is σ = 141445286424. Its totient is φ = 43379832960.

The previous prime is 81470118281. The next prime is 81470118299. The reversal of 81470118285 is 58281107418.

It can be written as a sum of positive squares in 4 ways, for example, as 6114927204 + 75355191081 = 78198^2 + 274509^2 .

It is not a de Polignac number, because 81470118285 - 2² = 81470118281 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 81470118285.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81470118281) 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, 1449126 + ... + 1504295.

It is an arithmetic number, because the mean of its divisors is an integer number (5893553601).

Almost surely, 2^81470118285 is an apocalyptic number.

It is an amenable number.

81470118285 is a deficient number, since it is larger than the sum of its proper divisors (59975168139).

81470118285 is a wasteful number, since it uses less digits than its factorization.

81470118285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2954045 (or 2954042 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 45.

The spelling of 81470118285 in words is "eighty-one billion, four hundred seventy million, one hundred eighteen thousand, two hundred eighty-five".