66507136 has 16 divisors (see below), whose sum is σ = 132494940. Its totient is φ = 33253504.

The previous prime is 66507131. The next prime is 66507137. The reversal of 66507136 is 63170566.

It is a happy number.

66507136 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66507131) by changing a digit.

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 as a sum of consecutive naturals, namely, 259666 + ... + 259921.

Almost surely, 2^66507136 is an apocalyptic number.

It is an amenable number.

66507136 is a deficient number, since it is larger than the sum of its proper divisors (65987804).

66507136 is an equidigital number, since it uses as much as digits as its factorization.

66507136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519601 (or 519589 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 66507136 is about 8155.1907396455. The cubic root of 66507136 is about 405.1564421279.

The spelling of 66507136 in words is "sixty-six million, five hundred seven thousand, one hundred thirty-six".