81502351814 has 8 divisors (see below), whose sum is σ = 131657645280. Its totient is φ = 37616470056.

The previous prime is 81502351811. The next prime is 81502351837. The reversal of 81502351814 is 41815320518.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81502351811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1567352894 + ... + 1567352945.

It is an arithmetic number, because the mean of its divisors is an integer number (16457205660).

Almost surely, 2^81502351814 is an apocalyptic number.

81502351814 is a deficient number, since it is larger than the sum of its proper divisors (50155293466).

81502351814 is a wasteful number, since it uses less digits than its factorization.

81502351814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3134705854.

The product of its (nonzero) digits is 38400, while the sum is 38.

The spelling of 81502351814 in words is "eighty-one billion, five hundred two million, three hundred fifty-one thousand, eight hundred fourteen".