642473633 has 4 divisors (see below), whose sum is σ = 642641328. Its totient is φ = 642305940.

The previous prime is 642473617. The next prime is 642473681. The reversal of 642473633 is 336374246.

642473633 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 642473633 - 2⁴ = 642473617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642473603) 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, 77963 + ... + 85808.

It is an arithmetic number, because the mean of its divisors is an integer number (160660332).

Almost surely, 2^642473633 is an apocalyptic number.

It is an amenable number.

642473633 is a deficient number, since it is larger than the sum of its proper divisors (167695).

642473633 is a wasteful number, since it uses less digits than its factorization.

642473633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167694.

The product of its digits is 217728, while the sum is 38.

The square root of 642473633 is about 25347.0635971901. The cubic root of 642473633 is about 862.8827154855.

The spelling of 642473633 in words is "six hundred forty-two million, four hundred seventy-three thousand, six hundred thirty-three".