66823801 has 16 divisors (see below), whose sum is σ = 77034240. Its totient is φ = 57393280.

The previous prime is 66823789. The next prime is 66823811. The reversal of 66823801 is 10832866.

It is a cyclic number.

It is not a de Polignac number, because 66823801 - 2¹⁵ = 66791033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66823811) 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, 12765 + ... + 17221.

It is an arithmetic number, because the mean of its divisors is an integer number (4814640).

Almost surely, 2^66823801 is an apocalyptic number.

It is an amenable number.

66823801 is a deficient number, since it is larger than the sum of its proper divisors (10210439).

66823801 is a wasteful number, since it uses less digits than its factorization.

66823801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4544.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 66823801 is about 8174.5826193146. The cubic root of 66823801 is about 405.7984573226.

The spelling of 66823801 in words is "sixty-six million, eight hundred twenty-three thousand, eight hundred one".