643461014723 has 2 divisors, whose sum is σ = 643461014724. Its totient is φ = 643461014722.

The previous prime is 643461014671. The next prime is 643461014741. The reversal of 643461014723 is 327410164346.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643461014723 - 2⁶ = 643461014659 is a prime.

It is not a weakly prime, because it can be changed into another prime (643461017723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321730507361 + 321730507362.

It is an arithmetic number, because the mean of its divisors is an integer number (321730507362).

Almost surely, 2^643461014723 is an apocalyptic number.

643461014723 is a deficient number, since it is larger than the sum of its proper divisors (1).

643461014723 is an equidigital number, since it uses as much as digits as its factorization.

643461014723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 41.

The spelling of 643461014723 in words is "six hundred forty-three billion, four hundred sixty-one million, fourteen thousand, seven hundred twenty-three".