642516443 has 4 divisors (see below), whose sum is σ = 642896760. Its totient is φ = 642136128.

The previous prime is 642516439. The next prime is 642516451. The reversal of 642516443 is 344615246.

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

It is a cyclic number.

It is not a de Polignac number, because 642516443 - 2² = 642516439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642516473) 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, 187613 + ... + 191006.

It is an arithmetic number, because the mean of its divisors is an integer number (160724190).

Almost surely, 2^642516443 is an apocalyptic number.

642516443 is a deficient number, since it is larger than the sum of its proper divisors (380317).

642516443 is a wasteful number, since it uses less digits than its factorization.

642516443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380316.

The product of its digits is 69120, while the sum is 35.

The square root of 642516443 is about 25347.9080596407. The cubic root of 642516443 is about 862.9018805722.

The spelling of 642516443 in words is "six hundred forty-two million, five hundred sixteen thousand, four hundred forty-three".