66475551 has 8 divisors (see below), whose sum is σ = 89281584. Its totient is φ = 43993280.

The previous prime is 66475537. The next prime is 66475567. The reversal of 66475551 is 15557466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66475551 - 2¹¹ = 66473503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66475571) 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 7 ways as a sum of consecutive naturals, for example, 80460 + ... + 81281.

It is an arithmetic number, because the mean of its divisors is an integer number (11160198).

Almost surely, 2^66475551 is an apocalyptic number.

66475551 is a deficient number, since it is larger than the sum of its proper divisors (22806033).

66475551 is a wasteful number, since it uses less digits than its factorization.

66475551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161881.

The product of its digits is 126000, while the sum is 39.

The square root of 66475551 is about 8153.2540129693. The cubic root of 66475551 is about 405.0922941616.

The spelling of 66475551 in words is "sixty-six million, four hundred seventy-five thousand, five hundred fifty-one".