81085637946 has 8 divisors (see below), whose sum is σ = 162171275904. Its totient is φ = 27028545980.

The previous prime is 81085637939. The next prime is 81085637959. The reversal of 81085637946 is 64973658018.

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

81085637946 is an admirable number.

It is a super-3 number, since 3×81085637946³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6757136490 + ... + 6757136501.

It is an arithmetic number, because the mean of its divisors is an integer number (20271409488).

Almost surely, 2^81085637946 is an apocalyptic number.

81085637946 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.

81085637946 is a wasteful number, since it uses less digits than its factorization.

81085637946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13514272996.

The product of its (nonzero) digits is 8709120, while the sum is 57.

The spelling of 81085637946 in words is "eighty-one billion, eighty-five million, six hundred thirty-seven thousand, nine hundred forty-six".