66918136 has 8 divisors (see below), whose sum is σ = 125471520. Its totient is φ = 33459064.

The previous prime is 66918113. The next prime is 66918149. The reversal of 66918136 is 63181966.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4182376 + ... + 4182391.

It is an arithmetic number, because the mean of its divisors is an integer number (15683940).

Almost surely, 2^66918136 is an apocalyptic number.

It is an amenable number.

66918136 is a deficient number, since it is larger than the sum of its proper divisors (58553384).

66918136 is a wasteful number, since it uses less digits than its factorization.

66918136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8364773 (or 8364769 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 66918136 is about 8180.3506037333. The cubic root of 66918136 is about 405.9893224400.

The spelling of 66918136 in words is "sixty-six million, nine hundred eighteen thousand, one hundred thirty-six".