66535885 has 16 divisors (see below), whose sum is σ = 86567040. Its totient is φ = 48801600.

The previous prime is 66535883. The next prime is 66535913. The reversal of 66535885 is 58853566.

It is not a de Polignac number, because 66535885 - 2¹ = 66535883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66535883) 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, 6426 + ... + 13204.

It is an arithmetic number, because the mean of its divisors is an integer number (5410440).

Almost surely, 2^66535885 is an apocalyptic number.

66535885 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66535885 is a deficient number, since it is larger than the sum of its proper divisors (20031155).

66535885 is a wasteful number, since it uses less digits than its factorization.

66535885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6948.

The product of its digits is 864000, while the sum is 46.

The square root of 66535885 is about 8156.9531689228. The cubic root of 66535885 is about 405.2148126293.

The spelling of 66535885 in words is "sixty-six million, five hundred thirty-five thousand, eight hundred eighty-five".