642670033 has 2 divisors, whose sum is σ = 642670034. Its totient is φ = 642670032.

The previous prime is 642670013. The next prime is 642670051. The reversal of 642670033 is 330076246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 404492544 + 238177489 = 20112^2 + 15433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642670033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642669977 and 642670004.

It is not a weakly prime, because it can be changed into another prime (642670013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321335016 + 321335017.

It is an arithmetic number, because the mean of its divisors is an integer number (321335017).

Almost surely, 2^642670033 is an apocalyptic number.

It is an amenable number.

642670033 is a deficient number, since it is larger than the sum of its proper divisors (1).

642670033 is an equidigital number, since it uses as much as digits as its factorization.

642670033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 31.

The square root of 642670033 is about 25350.9375171807. The cubic root of 642670033 is about 862.9706324006.

The spelling of 642670033 in words is "six hundred forty-two million, six hundred seventy thousand, thirty-three".