81085069670 has 16 divisors (see below), whose sum is σ = 159221591568. Its totient is φ = 29485479840.

The previous prime is 81085069633. The next prime is 81085069687. The reversal of 81085069670 is 7696058018.

It is a happy number.

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, 368568389 + ... + 368568608.

It is an arithmetic number, because the mean of its divisors is an integer number (9951349473).

Almost surely, 2^81085069670 is an apocalyptic number.

81085069670 is a deficient number, since it is larger than the sum of its proper divisors (78136521898).

81085069670 is a wasteful number, since it uses less digits than its factorization.

81085069670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737137015.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 81085069670 in words is "eighty-one billion, eighty-five million, sixty-nine thousand, six hundred seventy".