642633340303 has 4 divisors (see below), whose sum is σ = 645299868928. Its totient is φ = 639966811680.

The previous prime is 642633340249. The next prime is 642633340397. The reversal of 642633340303 is 303043336246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642633340303 is a prime.

It is a super-2 number, since 2×642633340303² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642633340903) 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, 1333263951 + ... + 1333264432.

It is an arithmetic number, because the mean of its divisors is an integer number (161324967232).

Almost surely, 2^642633340303 is an apocalyptic number.

642633340303 is a deficient number, since it is larger than the sum of its proper divisors (2666528625).

642633340303 is a wasteful number, since it uses less digits than its factorization.

642633340303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2666528624.

The product of its (nonzero) digits is 279936, while the sum is 37.

Adding to 642633340303 its reverse (303043336246), we get a palindrome (945676676549).

The spelling of 642633340303 in words is "six hundred forty-two billion, six hundred thirty-three million, three hundred forty thousand, three hundred three".