643154446091 has 2 divisors, whose sum is σ = 643154446092. Its totient is φ = 643154446090.

The previous prime is 643154446037. The next prime is 643154446267. The reversal of 643154446091 is 190644451346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643154446091 - 2⁶ = 643154446027 is a prime.

It is not a weakly prime, because it can be changed into another prime (643154446391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321577223045 + 321577223046.

It is an arithmetic number, because the mean of its divisors is an integer number (321577223046).

Almost surely, 2^643154446091 is an apocalyptic number.

643154446091 is a deficient number, since it is larger than the sum of its proper divisors (1).

643154446091 is an equidigital number, since it uses as much as digits as its factorization.

643154446091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 643154446091 in words is "six hundred forty-three billion, one hundred fifty-four million, four hundred forty-six thousand, ninety-one".