66618116 has 6 divisors (see below), whose sum is σ = 116581710. Its totient is φ = 33309056.

The previous prime is 66618109. The next prime is 66618127. The reversal of 66618116 is 61181666.

It can be written as a sum of positive squares in only one way, i.e., 65286400 + 1331716 = 8080^2 + 1154^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 8327261 + ... + 8327268.

It is an arithmetic number, because the mean of its divisors is an integer number (19430285).

Almost surely, 2^66618116 is an apocalyptic number.

It is an amenable number.

66618116 is a deficient number, since it is larger than the sum of its proper divisors (49963594).

66618116 is a wasteful number, since it uses less digits than its factorization.

66618116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16654533 (or 16654531 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 66618116 is about 8161.9921587808. The cubic root of 66618116 is about 405.3816774800.

The spelling of 66618116 in words is "sixty-six million, six hundred eighteen thousand, one hundred sixteen".