66516775 has 12 divisors (see below), whose sum is σ = 88825912. Its totient is φ = 49119840.

The previous prime is 66516763. The next prime is 66516799. The reversal of 66516775 is 57761566.

It is not a de Polignac number, because 66516775 - 2²¹ = 64419623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 102009 + ... + 102658.

Almost surely, 2^66516775 is an apocalyptic number.

66516775 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66516775 is a deficient number, since it is larger than the sum of its proper divisors (22309137).

66516775 is a wasteful number, since it uses less digits than its factorization.

66516775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204690 (or 204685 counting only the distinct ones).

The product of its digits is 264600, while the sum is 43.

The square root of 66516775 is about 8155.7816915364. The cubic root of 66516775 is about 405.1760145354.

The spelling of 66516775 in words is "sixty-six million, five hundred sixteen thousand, seven hundred seventy-five".