81068868413 has 8 divisors (see below), whose sum is σ = 87307533600. Its totient is φ = 74830574448.

The previous prime is 81068868401. The next prime is 81068868421. The reversal of 81068868413 is 31486886018.

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

It is a cyclic number.

It is not a de Polignac number, because 81068868413 - 2¹⁶ = 81068802877 is a prime.

It is a super-2 number, since 2×81068868413² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81068838413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501998 + ... + 643536.

It is an arithmetic number, because the mean of its divisors is an integer number (10913441700).

Almost surely, 2^81068868413 is an apocalyptic number.

It is an amenable number.

81068868413 is a deficient number, since it is larger than the sum of its proper divisors (6238665187).

81068868413 is a wasteful number, since it uses less digits than its factorization.

81068868413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185611.

The product of its (nonzero) digits is 1769472, while the sum is 53.

The spelling of 81068868413 in words is "eighty-one billion, sixty-eight million, eight hundred sixty-eight thousand, four hundred thirteen".