81260162164008 has 80 divisors (see below), whose sum is σ = 227605086472500. Its totient is φ = 27086555119104.

The previous prime is 81260162163997. The next prime is 81260162164121. The reversal of 81260162164008 is 80046126106218.

It is a happy number.

81260162164008 is a `hidden beast` number, since 8 + 1 + 26 + 0 + 1 + 6 + 216 + 400 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 55625970391524 + 25634191772484 = 7458282^2 + 5063022^2 .

It is a super-3 number, since 3×81260162164008³ (a number of 43 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 153018688 + ... + 153548816.

Almost surely, 2^{81260162164008} is an apocalyptic number.

It is an amenable number.

81260162164008 is an abundant number, since it is smaller than the sum of its proper divisors (146344924308492).

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

81260162164008 is a wasteful number, since it uses less digits than its factorization.

81260162164008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766696 (or 766683 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 81260162164008 in words is "eighty-one trillion, two hundred sixty billion, one hundred sixty-two million, one hundred sixty-four thousand, eight".