642632533 has 4 divisors (see below), whose sum is σ = 646480800. Its totient is φ = 638784268.

The previous prime is 642632527. The next prime is 642632567. The reversal of 642632533 is 335236246.

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, and also an emirpimes, since its reverse is a distinct semiprime: 335236246 = 2 ⋅167618123.

It is a cyclic number.

It is not a de Polignac number, because 642632533 - 2¹³ = 642624341 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 (642632513) 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, 1923883 + ... + 1924216.

It is an arithmetic number, because the mean of its divisors is an integer number (161620200).

Almost surely, 2^642632533 is an apocalyptic number.

It is an amenable number.

642632533 is a deficient number, since it is larger than the sum of its proper divisors (3848267).

642632533 is a wasteful number, since it uses less digits than its factorization.

642632533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3848266.

The product of its digits is 77760, while the sum is 34.

The square root of 642632533 is about 25350.1978887740. The cubic root of 642632533 is about 862.9538472042.

Adding to 642632533 its reverse (335236246), we get a palindrome (977868779).

The spelling of 642632533 in words is "six hundred forty-two million, six hundred thirty-two thousand, five hundred thirty-three".