655220001 has 32 divisors (see below), whose sum is σ = 943263360. Its totient is φ = 403070976.

The previous prime is 655219987. The next prime is 655220017. The reversal of 655220001 is 100022556.

655220001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 655220001 - 2¹⁵ = 655187233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 655220001.

It is not an unprimeable number, because it can be changed into a prime (655220081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1151245 + ... + 1151813.

It is an arithmetic number, because the mean of its divisors is an integer number (29476980).

Almost surely, 2^655220001 is an apocalyptic number.

It is an amenable number.

655220001 is a deficient number, since it is larger than the sum of its proper divisors (288043359).

655220001 is a wasteful number, since it uses less digits than its factorization.

655220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 655220001 is about 25597.2654984864. The cubic root of 655220001 is about 868.5517813835.

Adding to 655220001 its reverse (100022556), we get a palindrome (755242557).

The spelling of 655220001 in words is "six hundred fifty-five million, two hundred twenty thousand, one".