81380706606217 has 16 divisors (see below), whose sum is σ = 86965188710400. Its totient is φ = 75884933203200.

The previous prime is 81380706606193. The next prime is 81380706606253. The reversal of 81380706606217 is 71260660708318.

It is a cyclic number.

It is not a de Polignac number, because 81380706606217 - 2¹⁵ = 81380706573449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81380706696217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21881592 + ... + 25329142.

It is an arithmetic number, because the mean of its divisors is an integer number (5435324294400).

Almost surely, 2^{81380706606217} is an apocalyptic number.

It is an amenable number.

81380706606217 is a deficient number, since it is larger than the sum of its proper divisors (5584482104183).

81380706606217 is a wasteful number, since it uses less digits than its factorization.

81380706606217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3460416.

The product of its (nonzero) digits is 4064256, while the sum is 55.

The spelling of 81380706606217 in words is "eighty-one trillion, three hundred eighty billion, seven hundred six million, six hundred six thousand, two hundred seventeen".