66722601 has 16 divisors (see below), whose sum is σ = 98884800. Its totient is φ = 39673920.

The previous prime is 66722587. The next prime is 66722611. The reversal of 66722601 is 10622766.

It is not a de Polignac number, because 66722601 - 2¹¹ = 66720553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66722611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17326 + ... + 20823.

It is an arithmetic number, because the mean of its divisors is an integer number (6180300).

Almost surely, 2^66722601 is an apocalyptic number.

It is an amenable number.

66722601 is a deficient number, since it is larger than the sum of its proper divisors (32162199).

66722601 is a wasteful number, since it uses less digits than its factorization.

66722601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38216.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 66722601 is about 8168.3903555107. The cubic root of 66722601 is about 405.5935026425.

The spelling of 66722601 in words is "sixty-six million, seven hundred twenty-two thousand, six hundred one".