66501418 has 16 divisors (see below), whose sum is σ = 104276160. Its totient is φ = 31747936.

The previous prime is 66501403. The next prime is 66501451. The reversal of 66501418 is 81410566.

It is a self number, because there is not a number n which added to its sum of digits gives 66501418.

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 in 7 ways as a sum of consecutive naturals, for example, 36321 + ... + 38107.

It is an arithmetic number, because the mean of its divisors is an integer number (6517260).

Almost surely, 2^66501418 is an apocalyptic number.

66501418 is a deficient number, since it is larger than the sum of its proper divisors (37774742).

66501418 is a wasteful number, since it uses less digits than its factorization.

66501418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2621.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 66501418 is about 8154.8401578449. The cubic root of 66501418 is about 405.1448305873.

The spelling of 66501418 in words is "sixty-six million, five hundred one thousand, four hundred eighteen".