81478656125427 has 16 divisors (see below), whose sum is σ = 118515496125312. Its totient is φ = 49380550705920.

The previous prime is 81478656125387. The next prime is 81478656125483. The reversal of 81478656125427 is 72452165687418.

It is not a de Polignac number, because 81478656125427 - 2⁸ = 81478656125171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81478656125227) 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, 7655673 + ... + 14885114.

It is an arithmetic number, because the mean of its divisors is an integer number (7407218507832).

Almost surely, 2^{81478656125427} is an apocalyptic number.

81478656125427 is a deficient number, since it is larger than the sum of its proper divisors (37036839999885).

81478656125427 is a wasteful number, since it uses less digits than its factorization.

81478656125427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22650338.

The product of its digits is 180633600, while the sum is 66.

The spelling of 81478656125427 in words is "eighty-one trillion, four hundred seventy-eight billion, six hundred fifty-six million, one hundred twenty-five thousand, four hundred twenty-seven".