81378115214 has 8 divisors (see below), whose sum is σ = 133164188568. Its totient is φ = 36990052360.

The previous prime is 81378115207. The next prime is 81378115237. The reversal of 81378115214 is 41251187318.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1849502597 + ... + 1849502640.

It is an arithmetic number, because the mean of its divisors is an integer number (16645523571).

Almost surely, 2^81378115214 is an apocalyptic number.

81378115214 is a deficient number, since it is larger than the sum of its proper divisors (51786073354).

81378115214 is a wasteful number, since it uses less digits than its factorization.

81378115214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3699005250.

The product of its digits is 53760, while the sum is 41.

The spelling of 81378115214 in words is "eighty-one billion, three hundred seventy-eight million, one hundred fifteen thousand, two hundred fourteen".