642565455 has 16 divisors (see below), whose sum is σ = 1174977024. Its totient is φ = 293744160.

The previous prime is 642565393. The next prime is 642565457. The reversal of 642565455 is 554565246.

It is a happy number.

642565455 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 642565455 - 2⁹ = 642564943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642565457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3059731 + ... + 3059940.

It is an arithmetic number, because the mean of its divisors is an integer number (73436064).

Almost surely, 2^642565455 is an apocalyptic number.

642565455 is a deficient number, since it is larger than the sum of its proper divisors (532411569).

642565455 is a wasteful number, since it uses less digits than its factorization.

642565455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6119686.

The product of its digits is 720000, while the sum is 42.

The square root of 642565455 is about 25348.8748271003. The cubic root of 642565455 is about 862.9238211114.

The spelling of 642565455 in words is "six hundred forty-two million, five hundred sixty-five thousand, four hundred fifty-five".