81842756015 has 8 divisors (see below), whose sum is σ = 98332710480. Its totient is φ = 65393269312.

The previous prime is 81842756011. The next prime is 81842756033. The reversal of 81842756015 is 51065724818.

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

It is a cyclic number.

It is not a de Polignac number, because 81842756015 - 2² = 81842756011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81842756011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10112489 + ... + 10120578.

It is an arithmetic number, because the mean of its divisors is an integer number (12291588810).

Almost surely, 2^81842756015 is an apocalyptic number.

81842756015 is a deficient number, since it is larger than the sum of its proper divisors (16489954465).

81842756015 is a wasteful number, since it uses less digits than its factorization.

81842756015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20233881.

The product of its (nonzero) digits is 537600, while the sum is 47.

The spelling of 81842756015 in words is "eighty-one billion, eight hundred forty-two million, seven hundred fifty-six thousand, fifteen".