81718350052550 has 24 divisors (see below), whose sum is σ = 152001978846696. Its totient is φ = 32686082440640.

The previous prime is 81718350052511. The next prime is 81718350052571. The reversal of 81718350052550 is 5525005381718.

It is a super-2 number, since 2×81718350052550² (a number of 29 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30126359 + ... + 32726658.

It is an arithmetic number, because the mean of its divisors is an integer number (6333415785279).

Almost surely, 2^{81718350052550} is an apocalyptic number.

81718350052550 is a deficient number, since it is larger than the sum of its proper divisors (70283628794146).

81718350052550 is a wasteful number, since it uses less digits than its factorization.

81718350052550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62879032 (or 62879027 counting only the distinct ones).

The product of its (nonzero) digits is 1680000, while the sum is 50.

The spelling of 81718350052550 in words is "eighty-one trillion, seven hundred eighteen billion, three hundred fifty million, fifty-two thousand, five hundred fifty".