81380706606216 has 48 divisors (see below), whose sum is σ = 220496522426700. Its totient is φ = 27115770874752.

The previous prime is 81380706606193. The next prime is 81380706606253. The reversal of 81380706606216 is 61260660708318.

81380706606216 is a `hidden beast` number, since 8 + 1 + 3 + 8 + 0 + 7 + 0 + 6 + 6 + 0 + 621 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 80488350540900 + 892356065316 = 8971530^2 + 944646^2 .

It is a super-4 number, since 4×81380706606216⁴ (a number of 57 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 231725971 + ... + 232076898.

Almost surely, 2^{81380706606216} is an apocalyptic number.

It is an amenable number.

81380706606216 is an abundant number, since it is smaller than the sum of its proper divisors (139115815820484).

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

81380706606216 is a wasteful number, since it uses less digits than its factorization.

81380706606216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463805318 (or 463805311 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 81380706606216 in words is "eighty-one trillion, three hundred eighty billion, seven hundred six million, six hundred six thousand, two hundred sixteen".