81962570206 has 16 divisors (see below), whose sum is σ = 134128597248. Its totient is φ = 37253483800.

The previous prime is 81962570197. The next prime is 81962570213. The reversal of 81962570206 is 60207526918.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297801 + ... + 502603.

It is an arithmetic number, because the mean of its divisors is an integer number (8383037328).

Almost surely, 2^81962570206 is an apocalyptic number.

81962570206 is a deficient number, since it is larger than the sum of its proper divisors (52166027042).

81962570206 is a wasteful number, since it uses less digits than its factorization.

81962570206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223007.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 81962570206 in words is "eighty-one billion, nine hundred sixty-two million, five hundred seventy thousand, two hundred six".