66634401 has 8 divisors (see below), whose sum is σ = 88923744. Its totient is φ = 44384000.

The previous prime is 66634397. The next prime is 66634417. The reversal of 66634401 is 10443666.

66634401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66634401 - 2² = 66634397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66634481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5475 + ... + 12776.

It is an arithmetic number, because the mean of its divisors is an integer number (11115468).

Almost surely, 2^66634401 is an apocalyptic number.

It is an amenable number.

66634401 is a deficient number, since it is larger than the sum of its proper divisors (22289343).

66634401 is a wasteful number, since it uses less digits than its factorization.

66634401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19471.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 66634401 is about 8162.9897096591. The cubic root of 66634401 is about 405.4147070480.

The spelling of 66634401 in words is "sixty-six million, six hundred thirty-four thousand, four hundred one".