66560401 has 8 divisors (see below), whose sum is σ = 70139520. Its totient is φ = 62988912.

The previous prime is 66560369. The next prime is 66560407. The reversal of 66560401 is 10406566.

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 66560401 - 2⁵ = 66560369 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 66560401.

It is not an unprimeable number, because it can be changed into a prime (66560407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28971 + ... + 31183.

It is an arithmetic number, because the mean of its divisors is an integer number (8767440).

Almost surely, 2^66560401 is an apocalyptic number.

It is an amenable number.

66560401 is a deficient number, since it is larger than the sum of its proper divisors (3579119).

66560401 is a wasteful number, since it uses less digits than its factorization.

66560401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3815.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 66560401 is about 8158.4557975146. The cubic root of 66560401 is about 405.2645753824.

Adding to 66560401 its reverse (10406566), we get a palindrome (76966967).

The spelling of 66560401 in words is "sixty-six million, five hundred sixty thousand, four hundred one".