81527065478 has 16 divisors (see below), whose sum is σ = 133661073024. Its totient is φ = 37128074880.

The previous prime is 81527065469. The next prime is 81527065537. The reversal of 81527065478 is 87456072518.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38674025 + ... + 38676132.

It is an arithmetic number, because the mean of its divisors is an integer number (8353817064).

Almost surely, 2^81527065478 is an apocalyptic number.

81527065478 is a deficient number, since it is larger than the sum of its proper divisors (52134007546).

81527065478 is a wasteful number, since it uses less digits than its factorization.

81527065478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77350207.

The product of its (nonzero) digits is 3763200, while the sum is 53.

The spelling of 81527065478 in words is "eighty-one billion, five hundred twenty-seven million, sixty-five thousand, four hundred seventy-eight".