66332401 has 4 divisors (see below), whose sum is σ = 69823600. Its totient is φ = 62841204.

The previous prime is 66332377. The next prime is 66332407. The reversal of 66332401 is 10423366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10423366 = 2 ⋅5211683.

It is a cyclic number.

It is not a de Polignac number, because 66332401 - 2¹¹ = 66330353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66332407) 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, 1745571 + ... + 1745608.

It is an arithmetic number, because the mean of its divisors is an integer number (17455900).

Almost surely, 2^66332401 is an apocalyptic number.

It is an amenable number.

66332401 is a deficient number, since it is larger than the sum of its proper divisors (3491199).

66332401 is a wasteful number, since it uses less digits than its factorization.

66332401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3491198.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 66332401 is about 8144.4705782512. The cubic root of 66332401 is about 404.8013067944.

Adding to 66332401 its reverse (10423366), we get a palindrome (76755767).

The spelling of 66332401 in words is "sixty-six million, three hundred thirty-two thousand, four hundred one".