66173407 has 2 divisors, whose sum is σ = 66173408. Its totient is φ = 66173406.

The previous prime is 66173399. The next prime is 66173413. The reversal of 66173407 is 70437166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66173407 - 2³ = 66173399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66173417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33086703 + 33086704.

It is an arithmetic number, because the mean of its divisors is an integer number (33086704).

Almost surely, 2^66173407 is an apocalyptic number.

66173407 is a deficient number, since it is larger than the sum of its proper divisors (1).

66173407 is an equidigital number, since it uses as much as digits as its factorization.

66173407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 66173407 is about 8134.7038667674. The cubic root of 66173407 is about 404.4776214890.

The spelling of 66173407 in words is "sixty-six million, one hundred seventy-three thousand, four hundred seven".