66530775 has 24 divisors (see below), whose sum is σ = 116470224. Its totient is φ = 33395200.

The previous prime is 66530759. The next prime is 66530831. The reversal of 66530775 is 57703566.

It is not a de Polignac number, because 66530775 - 2⁴ = 66530759 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 24816 + ... + 27365.

It is an arithmetic number, because the mean of its divisors is an integer number (4852926).

Almost surely, 2^66530775 is an apocalyptic number.

66530775 is a deficient number, since it is larger than the sum of its proper divisors (49939449).

66530775 is a wasteful number, since it uses less digits than its factorization.

66530775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52211 (or 52206 counting only the distinct ones).

The product of its (nonzero) digits is 132300, while the sum is 39.

The square root of 66530775 is about 8156.6399332078. The cubic root of 66530775 is about 405.2044387751.

The spelling of 66530775 in words is "sixty-six million, five hundred thirty thousand, seven hundred seventy-five".