655465021 has 8 divisors (see below), whose sum is σ = 692146080. Its totient is φ = 619002288.

The previous prime is 655465007. The next prime is 655465033. The reversal of 655465021 is 120564556.

655465021 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 655465021 - 2²⁵ = 621910589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655465061) 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, 48391 + ... + 60436.

It is an arithmetic number, because the mean of its divisors is an integer number (86518260).

Almost surely, 2^655465021 is an apocalyptic number.

It is an amenable number.

655465021 is a deficient number, since it is larger than the sum of its proper divisors (36681059).

655465021 is a wasteful number, since it uses less digits than its factorization.

655465021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109163.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 655465021 is about 25602.0511092373. The cubic root of 655465021 is about 868.6600330829.

The spelling of 655465021 in words is "six hundred fifty-five million, four hundred sixty-five thousand, twenty-one".