66722185 has 16 divisors (see below), whose sum is σ = 83100240. Its totient is φ = 51367680.

The previous prime is 66722171. The next prime is 66722191. The reversal of 66722185 is 58122766.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 478864 + 66243321 = 692^2 + 8139^2 .

It is not a de Polignac number, because 66722185 - 2⁵ = 66722153 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60499 + ... + 61591.

It is an arithmetic number, because the mean of its divisors is an integer number (5193765).

Almost surely, 2^66722185 is an apocalyptic number.

It is an amenable number.

66722185 is a deficient number, since it is larger than the sum of its proper divisors (16378055).

66722185 is a wasteful number, since it uses less digits than its factorization.

66722185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548.

The product of its digits is 40320, while the sum is 37.

The square root of 66722185 is about 8168.3648914578. The cubic root of 66722185 is about 405.5926597135.

The spelling of 66722185 in words is "sixty-six million, seven hundred twenty-two thousand, one hundred eighty-five".