642008803 has 4 divisors (see below), whose sum is σ = 675798760. Its totient is φ = 608218848.

The previous prime is 642008789. The next prime is 642008819. The reversal of 642008803 is 308800246.

It is a happy number.

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 642008803 - 2⁹ = 642008291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642008863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16894950 + ... + 16894987.

It is an arithmetic number, because the mean of its divisors is an integer number (168949690).

Almost surely, 2^642008803 is an apocalyptic number.

642008803 is a deficient number, since it is larger than the sum of its proper divisors (33789957).

642008803 is a wasteful number, since it uses less digits than its factorization.

642008803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33789956.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 642008803 is about 25337.8926313930. The cubic root of 642008803 is about 862.6745665844.

The spelling of 642008803 in words is "six hundred forty-two million, eight thousand, eight hundred three".