642333523 has 8 divisors (see below), whose sum is σ = 693354816. Its totient is φ = 591542400.

The previous prime is 642333493. The next prime is 642333539. The reversal of 642333523 is 325333246.

642333523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642333523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642333823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51718 + ... + 62923.

It is an arithmetic number, because the mean of its divisors is an integer number (86669352).

Almost surely, 2^642333523 is an apocalyptic number.

642333523 is a deficient number, since it is larger than the sum of its proper divisors (51021293).

642333523 is a wasteful number, since it uses less digits than its factorization.

642333523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115085.

The product of its digits is 38880, while the sum is 31.

The square root of 642333523 is about 25344.2996154954. The cubic root of 642333523 is about 862.8199853953.

Adding to 642333523 its reverse (325333246), we get a palindrome (967666769).

The spelling of 642333523 in words is "six hundred forty-two million, three hundred thirty-three thousand, five hundred twenty-three".