81501348718 has 8 divisors (see below), whose sum is σ = 123799517280. Its totient is φ = 40234842960.

The previous prime is 81501348697. The next prime is 81501348737. The reversal of 81501348718 is 81784310518.

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, 257915503 + ... + 257915818.

It is an arithmetic number, because the mean of its divisors is an integer number (15474939660).

Almost surely, 2^81501348718 is an apocalyptic number.

81501348718 is a deficient number, since it is larger than the sum of its proper divisors (42298168562).

81501348718 is a wasteful number, since it uses less digits than its factorization.

81501348718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515831402.

The product of its (nonzero) digits is 215040, while the sum is 46.

The spelling of 81501348718 in words is "eighty-one billion, five hundred one million, three hundred forty-eight thousand, seven hundred eighteen".