66887575 has 18 divisors (see below), whose sum is σ = 84972984. Its totient is φ = 52229520.

The previous prime is 66887573. The next prime is 66887603. The reversal of 66887575 is 57578866.

It is not a de Polignac number, because 66887575 - 2¹ = 66887573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66887573) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 45502 + ... + 46948.

Almost surely, 2^66887575 is an apocalyptic number.

66887575 is a deficient number, since it is larger than the sum of its proper divisors (18085409).

66887575 is a wasteful number, since it uses less digits than its factorization.

66887575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543 (or 1495 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 52.

The square root of 66887575 is about 8178.4824386924. The cubic root of 66887575 is about 405.9275089581.

The spelling of 66887575 in words is "sixty-six million, eight hundred eighty-seven thousand, five hundred seventy-five".