66851718350 has 24 divisors (see below), whose sum is σ = 129750467760. Its totient is φ = 25578048320.

The previous prime is 66851718319. The next prime is 66851718383. The reversal of 66851718350 is 5381715866.

It is a happy number.

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 Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29064815 + ... + 29067114.

It is an arithmetic number, because the mean of its divisors is an integer number (5406269490).

Almost surely, 2^66851718350 is an apocalyptic number.

66851718350 is a deficient number, since it is larger than the sum of its proper divisors (62898749410).

66851718350 is a wasteful number, since it uses less digits than its factorization.

66851718350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58131964 (or 58131959 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 66851718350 in words is "sixty-six billion, eight hundred fifty-one million, seven hundred eighteen thousand, three hundred fifty".