81378286414 has 32 divisors (see below), whose sum is σ = 131878978560. Its totient is φ = 37535140800.

The previous prime is 81378286393. The next prime is 81378286417. The reversal of 81378286414 is 41468287318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81378286417) 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, 764899 + ... + 864769.

It is an arithmetic number, because the mean of its divisors is an integer number (4121218080).

Almost surely, 2^81378286414 is an apocalyptic number.

81378286414 is a deficient number, since it is larger than the sum of its proper divisors (50500692146).

81378286414 is a wasteful number, since it uses less digits than its factorization.

81378286414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100456.

The product of its digits is 2064384, while the sum is 52.

The spelling of 81378286414 in words is "eighty-one billion, three hundred seventy-eight million, two hundred eighty-six thousand, four hundred fourteen".