66745406 has 16 divisors (see below), whose sum is σ = 123222624. Its totient is φ = 26404704.

The previous prime is 66745397. The next prime is 66745411. The reversal of 66745406 is 60454766.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66745406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183185 + ... + 183548.

It is an arithmetic number, because the mean of its divisors is an integer number (7701414).

Almost surely, 2^66745406 is an apocalyptic number.

66745406 is a deficient number, since it is larger than the sum of its proper divisors (56477218).

66745406 is a wasteful number, since it uses less digits than its factorization.

66745406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366755.

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 66745406 is about 8169.7861661123. The cubic root of 66745406 is about 405.6397064080.

The spelling of 66745406 in words is "sixty-six million, seven hundred forty-five thousand, four hundred six".