66587885 has 16 divisors (see below), whose sum is σ = 98345856. Its totient is φ = 42147648.

The previous prime is 66587879. The next prime is 66587887. The reversal of 66587885 is 58878566.

It is a cyclic number.

It is not a de Polignac number, because 66587885 - 2⁴ = 66587869 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66587887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72719 + ... + 73628.

It is an arithmetic number, because the mean of its divisors is an integer number (6146616).

Almost surely, 2^66587885 is an apocalyptic number.

66587885 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66587885 is a deficient number, since it is larger than the sum of its proper divisors (31757971).

66587885 is a wasteful number, since it uses less digits than its factorization.

66587885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146372.

The product of its digits is 3225600, while the sum is 53.

The square root of 66587885 is about 8160.1400110537. The cubic root of 66587885 is about 405.3203480777.

The spelling of 66587885 in words is "sixty-six million, five hundred eighty-seven thousand, eight hundred eighty-five".