66434401 has 4 divisors (see below), whose sum is σ = 72473904. Its totient is φ = 60394900.

The previous prime is 66434369. The next prime is 66434443. The reversal of 66434401 is 10443466.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 66434401 - 2⁵ = 66434369 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66434401.

It is not an unprimeable number, because it can be changed into a prime (66434461) 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, 3019735 + ... + 3019756.

It is an arithmetic number, because the mean of its divisors is an integer number (18118476).

Almost surely, 2^66434401 is an apocalyptic number.

It is an amenable number.

66434401 is a deficient number, since it is larger than the sum of its proper divisors (6039503).

66434401 is a wasteful number, since it uses less digits than its factorization.

66434401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6039502.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 66434401 is about 8150.7300899981. The cubic root of 66434401 is about 405.0086895458.

Adding to 66434401 its reverse (10443466), we get a palindrome (76877867).

The spelling of 66434401 in words is "sixty-six million, four hundred thirty-four thousand, four hundred one".