642425353 has 4 divisors (see below), whose sum is σ = 643060548. Its totient is φ = 641790160.

The previous prime is 642425341. The next prime is 642425401. The reversal of 642425353 is 353524246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 228221449 + 414203904 = 15107^2 + 20352^2 .

It is a cyclic number.

It is not a de Polignac number, because 642425353 - 2¹³ = 642417161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642425323) 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, 316078 + ... + 318103.

It is an arithmetic number, because the mean of its divisors is an integer number (160765137).

Almost surely, 2^642425353 is an apocalyptic number.

It is an amenable number.

642425353 is a deficient number, since it is larger than the sum of its proper divisors (635195).

642425353 is a wasteful number, since it uses less digits than its factorization.

642425353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635194.

The product of its digits is 86400, while the sum is 34.

The square root of 642425353 is about 25346.1112007345. Note that the first 3 decimals coincide. The cubic root of 642425353 is about 862.8611005797.

Adding to 642425353 its reverse (353524246), we get a palindrome (995949599).

The spelling of 642425353 in words is "six hundred forty-two million, four hundred twenty-five thousand, three hundred fifty-three".