66635940 has 48 divisors (see below), whose sum is σ = 213236352. Its totient is φ = 15230976.

The previous prime is 66635923. The next prime is 66635963. The reversal of 66635940 is 4953666.

It is a happy number.

66635940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78909 + ... + 79748.

It is an arithmetic number, because the mean of its divisors is an integer number (4442424).

Almost surely, 2^66635940 is an apocalyptic number.

66635940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66635940 is an abundant number, since it is smaller than the sum of its proper divisors (146600412).

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

66635940 is a wasteful number, since it uses less digits than its factorization.

66635940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158676 (or 158674 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 39.

The square root of 66635940 is about 8163.0839760473. The cubic root of 66635940 is about 405.4178282007.

The spelling of 66635940 in words is "sixty-six million, six hundred thirty-five thousand, nine hundred forty".