643154446267 has 2 divisors, whose sum is σ = 643154446268. Its totient is φ = 643154446266.

The previous prime is 643154446091. The next prime is 643154446303. The reversal of 643154446267 is 762644451346.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643154446267 is a prime.

It is a super-2 number, since 2×643154446267² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (643154426267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321577223133 + 321577223134.

It is an arithmetic number, because the mean of its divisors is an integer number (321577223134).

Almost surely, 2^643154446267 is an apocalyptic number.

643154446267 is a deficient number, since it is larger than the sum of its proper divisors (1).

643154446267 is an equidigital number, since it uses as much as digits as its factorization.

643154446267 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11612160, while the sum is 52.

The spelling of 643154446267 in words is "six hundred forty-three billion, one hundred fifty-four million, four hundred forty-six thousand, two hundred sixty-seven".