66508266 has 16 divisors (see below), whose sum is σ = 145109088. Its totient is φ = 20154000.

The previous prime is 66508231. The next prime is 66508271. The reversal of 66508266 is 66280566.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503785 + ... + 503916.

It is an arithmetic number, because the mean of its divisors is an integer number (9069318).

Almost surely, 2^66508266 is an apocalyptic number.

66508266 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66508266 is an abundant number, since it is smaller than the sum of its proper divisors (78600822).

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

66508266 is a wasteful number, since it uses less digits than its factorization.

66508266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007717.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 66508266 is about 8155.2600203795. The cubic root of 66508266 is about 405.1587367398.

The spelling of 66508266 in words is "sixty-six million, five hundred eight thousand, two hundred sixty-six".