642555001 has 32 divisors (see below), whose sum is σ = 784442880. Its totient is φ = 519321600.

The previous prime is 642554989. The next prime is 642555007. The reversal of 642555001 is 100555246.

642555001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 642555001 - 2⁷ = 642554873 is a prime.

It is a super-2 number, since 2×642555001² = 825753858620220002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642555007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 253621 + ... + 256141.

It is an arithmetic number, because the mean of its divisors is an integer number (24513840).

Almost surely, 2^642555001 is an apocalyptic number.

It is an amenable number.

642555001 is a deficient number, since it is larger than the sum of its proper divisors (141887879).

642555001 is a wasteful number, since it uses less digits than its factorization.

642555001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2625.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 642555001 is about 25348.6686238153. The cubic root of 642555001 is about 862.9191414042.

The spelling of 642555001 in words is "six hundred forty-two million, five hundred fifty-five thousand, one".