66475641 has 4 divisors (see below), whose sum is σ = 88634192. Its totient is φ = 44317092.

The previous prime is 66475639. The next prime is 66475657. The reversal of 66475641 is 14657466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66475641 - 2¹ = 66475639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66475641.

It is not an unprimeable number, because it can be changed into a prime (66475601) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11079271 + ... + 11079276.

It is an arithmetic number, because the mean of its divisors is an integer number (22158548).

Almost surely, 2^66475641 is an apocalyptic number.

It is an amenable number.

66475641 is a deficient number, since it is larger than the sum of its proper divisors (22158551).

66475641 is a wasteful number, since it uses less digits than its factorization.

66475641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22158550.

The product of its digits is 120960, while the sum is 39.

The square root of 66475641 is about 8153.2595322362. The cubic root of 66475641 is about 405.0924769772.

The spelling of 66475641 in words is "sixty-six million, four hundred seventy-five thousand, six hundred forty-one".