81781258314 has 32 divisors (see below), whose sum is σ = 187518301056. Its totient is φ = 23292360000.

The previous prime is 81781258289. The next prime is 81781258319. The reversal of 81781258314 is 41385218718.

It is a super-2 number, since 2×81781258314² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81781258319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3057937 + ... + 3084564.

It is an arithmetic number, because the mean of its divisors is an integer number (5859946908).

Almost surely, 2^81781258314 is an apocalyptic number.

81781258314 is an abundant number, since it is smaller than the sum of its proper divisors (105737042742).

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

81781258314 is a wasteful number, since it uses less digits than its factorization.

81781258314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6142830.

The product of its digits is 430080, while the sum is 48.

The spelling of 81781258314 in words is "eighty-one billion, seven hundred eighty-one million, two hundred fifty-eight thousand, three hundred fourteen".