81379154066 has 32 divisors (see below), whose sum is σ = 140907906048. Its totient is φ = 34528317120.

The previous prime is 81379154039. The next prime is 81379154069. The reversal of 81379154066 is 66045197318.

It is not an unprimeable number, because it can be changed into a prime (81379154069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 493076 + ... + 637088.

It is an arithmetic number, because the mean of its divisors is an integer number (4403372064).

Almost surely, 2^81379154066 is an apocalyptic number.

81379154066 is a deficient number, since it is larger than the sum of its proper divisors (59528751982).

81379154066 is a wasteful number, since it uses less digits than its factorization.

81379154066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144426.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 81379154066 in words is "eighty-one billion, three hundred seventy-nine million, one hundred fifty-four thousand, sixty-six".