643876153 has 2 divisors, whose sum is σ = 643876154. Its totient is φ = 643876152.

The previous prime is 643876127. The next prime is 643876201. The reversal of 643876153 is 351678346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 642977449 + 898704 = 25357^2 + 948^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643876153 is a prime.

It is not a weakly prime, because it can be changed into another prime (643870153) 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 as a sum of consecutive naturals, namely, 321938076 + 321938077.

It is an arithmetic number, because the mean of its divisors is an integer number (321938077).

Almost surely, 2^643876153 is an apocalyptic number.

It is an amenable number.

643876153 is a deficient number, since it is larger than the sum of its proper divisors (1).

643876153 is an equidigital number, since it uses as much as digits as its factorization.

643876153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 43.

The square root of 643876153 is about 25374.7148358361. The cubic root of 643876153 is about 863.5101501592.

The spelling of 643876153 in words is "six hundred forty-three million, eight hundred seventy-six thousand, one hundred fifty-three".