81565128014 has 8 divisors (see below), whose sum is σ = 122418705720. Its totient is φ = 40758892776.

The previous prime is 81565128011. The next prime is 81565128017. The reversal of 81565128014 is 41082156518.

It is an interprime number because it is at equal distance from previous prime (81565128011) and next prime (81565128017).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81565128011) 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, 11831309 + ... + 11838200.

It is an arithmetic number, because the mean of its divisors is an integer number (15302338215).

Almost surely, 2^81565128014 is an apocalyptic number.

81565128014 is a deficient number, since it is larger than the sum of its proper divisors (40853577706).

81565128014 is a wasteful number, since it uses less digits than its factorization.

81565128014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23671234.

The product of its (nonzero) digits is 76800, while the sum is 41.

The spelling of 81565128014 in words is "eighty-one billion, five hundred sixty-five million, one hundred twenty-eight thousand, fourteen".