66687351722 has 8 divisors (see below), whose sum is σ = 100078918500. Its totient is φ = 33327712224.

The previous prime is 66687351677. The next prime is 66687351733. The reversal of 66687351722 is 22715378666.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 60876186361 + 5811165361 = 246731^2 + 76231^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7976597 + ... + 7984952.

Almost surely, 2^66687351722 is an apocalyptic number.

66687351722 is a deficient number, since it is larger than the sum of its proper divisors (33391566778).

66687351722 is a wasteful number, since it uses less digits than its factorization.

66687351722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15963640.

The product of its digits is 5080320, while the sum is 53.

The spelling of 66687351722 in words is "sixty-six billion, six hundred eighty-seven million, three hundred fifty-one thousand, seven hundred twenty-two".