81958586010 has 64 divisors (see below), whose sum is σ = 236632320000. Its totient is φ = 17747422272.

The previous prime is 81958585957. The next prime is 81958586027. The reversal of 81958586010 is 1068585918.

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 31 ways as a sum of consecutive naturals, for example, 10266510 + ... + 10274489.

It is an arithmetic number, because the mean of its divisors is an integer number (3697380000).

Almost surely, 2^81958586010 is an apocalyptic number.

81958586010 is an abundant number, since it is smaller than the sum of its proper divisors (154673733990).

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

81958586010 is a wasteful number, since it uses less digits than its factorization.

81958586010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20541035.

The product of its (nonzero) digits is 691200, while the sum is 51.

The spelling of 81958586010 in words is "eighty-one billion, nine hundred fifty-eight million, five hundred eighty-six thousand, ten".