66004801 has 4 divisors (see below), whose sum is σ = 66162004. Its totient is φ = 65847600.

The previous prime is 66004787. The next prime is 66004811. The reversal of 66004801 is 10840066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12787776 + 53217025 = 3576^2 + 7295^2 .

It is a cyclic number.

It is not a de Polignac number, because 66004801 - 2¹⁵ = 65972033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66004811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77970 + ... + 78811.

It is an arithmetic number, because the mean of its divisors is an integer number (16540501).

Almost surely, 2^66004801 is an apocalyptic number.

It is an amenable number.

66004801 is a deficient number, since it is larger than the sum of its proper divisors (157203).

66004801 is a wasteful number, since it uses less digits than its factorization.

66004801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157202.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 66004801 is about 8124.3338803867. Note that the first 3 decimals coincide. The cubic root of 66004801 is about 404.1338008112.

Adding to 66004801 its reverse (10840066), we get a palindrome (76844867).

The spelling of 66004801 in words is "sixty-six million, four thousand, eight hundred one".