642556053 has 6 divisors (see below), whose sum is σ = 928136534. Its totient is φ = 428370696.

The previous prime is 642556051. The next prime is 642556139. The reversal of 642556053 is 350655246.

It is a happy number.

642556053 is a `hidden beast` number, since 6 + 42 + 5 + 5 + 605 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 450373284 + 192182769 = 21222^2 + 13863^2 .

It is not a de Polignac number, because 642556053 - 2¹ = 642556051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642555999 and 642556017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642556051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35697550 + ... + 35697567.

Almost surely, 2^642556053 is an apocalyptic number.

It is an amenable number.

642556053 is a deficient number, since it is larger than the sum of its proper divisors (285580481).

642556053 is a wasteful number, since it uses less digits than its factorization.

642556053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71395123 (or 71395120 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The square root of 642556053 is about 25348.6893744036. The cubic root of 642556053 is about 862.9196123317.

The spelling of 642556053 in words is "six hundred forty-two million, five hundred fifty-six thousand, fifty-three".