81527397927 has 8 divisors (see below), whose sum is σ = 108727334016. Its totient is φ = 54339530232.

The previous prime is 81527397899. The next prime is 81527397929. The reversal of 81527397927 is 72979372518.

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

It is not a de Polignac number, because 81527397927 - 2⁷ = 81527397799 is a prime.

It is a super-2 number, since 2×81527397927² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81527397929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3001323 + ... + 3028364.

It is an arithmetic number, because the mean of its divisors is an integer number (13590916752).

Almost surely, 2^81527397927 is an apocalyptic number.

81527397927 is a deficient number, since it is larger than the sum of its proper divisors (27199936089).

81527397927 is a wasteful number, since it uses less digits than its factorization.

81527397927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6034197.

The product of its digits is 13335840, while the sum is 60.

The spelling of 81527397927 in words is "eighty-one billion, five hundred twenty-seven million, three hundred ninety-seven thousand, nine hundred twenty-seven".