81312000006 has 16 divisors (see below), whose sum is σ = 162629877744. Its totient is φ = 27103020384.

The previous prime is 81311999983. The next prime is 81312000041. The reversal of 81312000006 is 60000021318.

It is a super-2 number, since 2×81312000006² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53565 + ... + 406808.

It is an arithmetic number, because the mean of its divisors is an integer number (10164367359).

Almost surely, 2^81312000006 is an apocalyptic number.

81312000006 is an abundant number, since it is smaller than the sum of its proper divisors (81317877738).

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

81312000006 is a wasteful number, since it uses less digits than its factorization.

81312000006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489815.

The product of its (nonzero) digits is 288, while the sum is 21.

The spelling of 81312000006 in words is "eighty-one billion, three hundred twelve million, six", and thus it is an aban number.