64506173 has 2 divisors, whose sum is σ = 64506174. Its totient is φ = 64506172.

The previous prime is 64506151. The next prime is 64506187. The reversal of 64506173 is 37160546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51811204 + 12694969 = 7198^2 + 3563^2 .

It is a cyclic number.

It is not a de Polignac number, because 64506173 - 2¹⁶ = 64440637 is a prime.

It is a super-2 number, since 2×64506173² = 8322092710211858, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64506073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32253086 + 32253087.

It is an arithmetic number, because the mean of its divisors is an integer number (32253087).

Almost surely, 2^64506173 is an apocalyptic number.

It is an amenable number.

64506173 is a deficient number, since it is larger than the sum of its proper divisors (1).

64506173 is an equidigital number, since it uses as much as digits as its factorization.

64506173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 64506173 is about 8031.5735071031. The cubic root of 64506173 is about 401.0517591661.

The spelling of 64506173 in words is "sixty-four million, five hundred six thousand, one hundred seventy-three".