6650401 has 4 divisors (see below), whose sum is σ = 6715072. Its totient is φ = 6585732.

The previous prime is 6650393. The next prime is 6650431. The reversal of 6650401 is 1040566.

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 6650401 - 2³ = 6650393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6650431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32181 + ... + 32386.

It is an arithmetic number, because the mean of its divisors is an integer number (1678768).

Almost surely, 2^6650401 is an apocalyptic number.

It is an amenable number.

6650401 is a deficient number, since it is larger than the sum of its proper divisors (64671).

6650401 is a wasteful number, since it uses less digits than its factorization.

6650401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64670.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 6650401 is about 2578.8371410386. The cubic root of 6650401 is about 188.0540153377.

Adding to 6650401 its reverse (1040566), we get a palindrome (7690967).

The spelling of 6650401 in words is "six million, six hundred fifty thousand, four hundred one".