66266801 has 16 divisors (see below), whose sum is σ = 69638400. Its totient is φ = 63011520.

The previous prime is 66266779. The next prime is 66266821. The reversal of 66266801 is 10866266.

It is a cyclic number.

It is not a de Polignac number, because 66266801 - 2¹⁰ = 66265777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66266821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332900 + ... + 333098.

It is an arithmetic number, because the mean of its divisors is an integer number (4352400).

Almost surely, 2^66266801 is an apocalyptic number.

66266801 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

66266801 is a deficient number, since it is larger than the sum of its proper divisors (3371599).

66266801 is a wasteful number, since it uses less digits than its factorization.

66266801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 66266801 is about 8140.4423098502. The cubic root of 66266801 is about 404.6678188657.

The spelling of 66266801 in words is "sixty-six million, two hundred sixty-six thousand, eight hundred one".