66173011 has 2 divisors, whose sum is σ = 66173012. Its totient is φ = 66173010.

The previous prime is 66172999. The next prime is 66173033. The reversal of 66173011 is 11037166.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66173011 - 2⁵ = 66172979 is a prime.

It is a super-2 number, since 2×66173011² = 8757734769612242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66173311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33086505 + 33086506.

It is an arithmetic number, because the mean of its divisors is an integer number (33086506).

Almost surely, 2^66173011 is an apocalyptic number.

66173011 is a deficient number, since it is larger than the sum of its proper divisors (1).

66173011 is an equidigital number, since it uses as much as digits as its factorization.

66173011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 66173011 is about 8134.6795265702. The cubic root of 66173011 is about 404.4768146520.

The spelling of 66173011 in words is "sixty-six million, one hundred seventy-three thousand, eleven".