66722105 has 8 divisors (see below), whose sum is σ = 81379464. Its totient is φ = 52502400.

The previous prime is 66722101. The next prime is 66722107. The reversal of 66722105 is 50122766.

It can be written as a sum of positive squares in 4 ways, for example, as 657721 + 66064384 = 811^2 + 8128^2 .

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

It is not a de Polignac number, because 66722105 - 2² = 66722101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66722101) 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, 109076 + ... + 109685.

It is an arithmetic number, because the mean of its divisors is an integer number (10172433).

Almost surely, 2^66722105 is an apocalyptic number.

It is an amenable number.

66722105 is a deficient number, since it is larger than the sum of its proper divisors (14657359).

66722105 is a wasteful number, since it uses less digits than its factorization.

66722105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218827.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 66722105 is about 8168.3599945154. The cubic root of 66722105 is about 405.5924976113.

The spelling of 66722105 in words is "sixty-six million, seven hundred twenty-two thousand, one hundred five".