81380706606215 has 4 divisors (see below), whose sum is σ = 97656847927464. Its totient is φ = 65104565284968.

The previous prime is 81380706606193. The next prime is 81380706606253. The reversal of 81380706606215 is 51260660708318.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81380706606215 - 2³² = 81376411638919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8138070660617 + ... + 8138070660626.

It is an arithmetic number, because the mean of its divisors is an integer number (24414211981866).

Almost surely, 2^{81380706606215} is an apocalyptic number.

81380706606215 is a deficient number, since it is larger than the sum of its proper divisors (16276141321249).

81380706606215 is a wasteful number, since it uses less digits than its factorization.

81380706606215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16276141321248.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 81380706606215 in words is "eighty-one trillion, three hundred eighty billion, seven hundred six million, six hundred six thousand, two hundred fifteen".