81849937305512 has 16 divisors (see below), whose sum is σ = 153468806068500. Its totient is φ = 40924922353920.

The previous prime is 81849937305491. The next prime is 81849937305541. The reversal of 81849937305512 is 21550373994818.

It can be written as a sum of positive squares in 2 ways, for example, as 80641226162116 + 1208711143396 = 8980046^2 + 1099414^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2408864 + ... + 13019312.

Almost surely, 2^{81849937305512} is an apocalyptic number.

It is an amenable number.

81849937305512 is a deficient number, since it is larger than the sum of its proper divisors (71618868762988).

81849937305512 is a wasteful number, since it uses less digits than its factorization.

81849937305512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11574716 (or 11574712 counting only the distinct ones).

The product of its (nonzero) digits is 65318400, while the sum is 65.

The spelling of 81849937305512 in words is "eighty-one trillion, eight hundred forty-nine billion, nine hundred thirty-seven million, three hundred five thousand, five hundred twelve".