81064806578 has 32 divisors (see below), whose sum is σ = 147305464704. Its totient is φ = 32662271232.

The previous prime is 81064806551. The next prime is 81064806587. The reversal of 81064806578 is 87560846018.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28100 + ... + 403632.

It is an arithmetic number, because the mean of its divisors is an integer number (4603295772).

Almost surely, 2^81064806578 is an apocalyptic number.

81064806578 is a deficient number, since it is larger than the sum of its proper divisors (66240658126).

81064806578 is a wasteful number, since it uses less digits than its factorization.

81064806578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376466.

The product of its (nonzero) digits is 2580480, while the sum is 53.

The spelling of 81064806578 in words is "eighty-one billion, sixty-four million, eight hundred six thousand, five hundred seventy-eight".