642025533 has 4 divisors (see below), whose sum is σ = 856034048. Its totient is φ = 428017020.

The previous prime is 642025511. The next prime is 642025543. The reversal of 642025533 is 335520246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 642025533 - 2⁸ = 642025277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642025533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642025543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107004253 + ... + 107004258.

It is an arithmetic number, because the mean of its divisors is an integer number (214008512).

Almost surely, 2^642025533 is an apocalyptic number.

It is an amenable number.

642025533 is a deficient number, since it is larger than the sum of its proper divisors (214008515).

642025533 is a wasteful number, since it uses less digits than its factorization.

642025533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214008514.

The product of its (nonzero) digits is 21600, while the sum is 30.

The square root of 642025533 is about 25338.2227671950. Note that the first 3 decimals coincide. The cubic root of 642025533 is about 862.6820599500.

Adding to 642025533 its reverse (335520246), we get a palindrome (977545779).

The spelling of 642025533 in words is "six hundred forty-two million, twenty-five thousand, five hundred thirty-three".