66535680 has 72 divisors (see below), whose sum is σ = 212510592. Its totient is φ = 17741824.

The previous prime is 66535673. The next prime is 66535687. The reversal of 66535680 is 8653566.

It is an interprime number because it is at equal distance from previous prime (66535673) and next prime (66535687).

It is not an unprimeable number, because it can be changed into a prime (66535687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4824 + ... + 12503.

It is an arithmetic number, because the mean of its divisors is an integer number (2951536).

Almost surely, 2^66535680 is an apocalyptic number.

66535680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66535680 is an abundant number, since it is smaller than the sum of its proper divisors (145974912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66535680 is a wasteful number, since it uses less digits than its factorization.

66535680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17351 (or 17337 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 66535680 is about 8156.9406029467. The cubic root of 66535680 is about 405.2143964673.

The spelling of 66535680 in words is "sixty-six million, five hundred thirty-five thousand, six hundred eighty".