81006366018 has 16 divisors (see below), whose sum is σ = 171542892960. Its totient is φ = 25413761856.

The previous prime is 81006366017. The next prime is 81006366037. The reversal of 81006366018 is 81066360018.

It is not an unprimeable number, because it can be changed into a prime (81006366017) 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 7 ways as a sum of consecutive naturals, for example, 397089928 + ... + 397090131.

It is an arithmetic number, because the mean of its divisors is an integer number (10721430810).

Almost surely, 2^81006366018 is an apocalyptic number.

81006366018 is an abundant number, since it is smaller than the sum of its proper divisors (90536526942).

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

81006366018 is a wasteful number, since it uses less digits than its factorization.

81006366018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794180081.

The product of its (nonzero) digits is 41472, while the sum is 39.

The spelling of 81006366018 in words is "eighty-one billion, six million, three hundred sixty-six thousand, eighteen".