81715860370 has 8 divisors (see below), whose sum is σ = 147088548684. Its totient is φ = 32686344144.

The previous prime is 81715860367. The next prime is 81715860377. The reversal of 81715860370 is 7306851718.

It can be written as a sum of positive squares in 2 ways, for example, as 78899753881 + 2816106489 = 280891^2 + 53067^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81715860370.

It is not an unprimeable number, because it can be changed into a prime (81715860377) 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, 4085793009 + ... + 4085793028.

Almost surely, 2^81715860370 is an apocalyptic number.

81715860370 is a deficient number, since it is larger than the sum of its proper divisors (65372688314).

81715860370 is a wasteful number, since it uses less digits than its factorization.

81715860370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8171586044.

The product of its (nonzero) digits is 282240, while the sum is 46.

The spelling of 81715860370 in words is "eighty-one billion, seven hundred fifteen million, eight hundred sixty thousand, three hundred seventy".