81011475066 has 8 divisors (see below), whose sum is σ = 162022950144. Its totient is φ = 27003825020.

The previous prime is 81011474861. The next prime is 81011475073. The reversal of 81011475066 is 66057411018.

It is a sphenic number, since it is the product of 3 distinct primes.

81011475066 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6750956250 + ... + 6750956261.

It is an arithmetic number, because the mean of its divisors is an integer number (20252868768).

Almost surely, 2^81011475066 is an apocalyptic number.

81011475066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81011475066 is a wasteful number, since it uses less digits than its factorization.

81011475066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13501912516.

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 81011475066 in words is "eighty-one billion, eleven million, four hundred seventy-five thousand, sixty-six".