81257615285295 has 32 divisors (see below), whose sum is σ = 131283526413312. Its totient is φ = 42913672422912.

The previous prime is 81257615285291. The next prime is 81257615285303. The reversal of 81257615285295 is 59258251675218.

It is not a de Polignac number, because 81257615285295 - 2² = 81257615285291 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81257615285291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20593927 + ... + 24220343.

It is an arithmetic number, because the mean of its divisors is an integer number (4102610200416).

Almost surely, 2^{81257615285295} is an apocalyptic number.

81257615285295 is a deficient number, since it is larger than the sum of its proper divisors (50025911128017).

81257615285295 is a wasteful number, since it uses less digits than its factorization.

81257615285295 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3641031.

The product of its digits is 120960000, while the sum is 66.

The spelling of 81257615285295 in words is "eighty-one trillion, two hundred fifty-seven billion, six hundred fifteen million, two hundred eighty-five thousand, two hundred ninety-five".