643476419 has 2 divisors, whose sum is σ = 643476420. Its totient is φ = 643476418.

The previous prime is 643476403. The next prime is 643476437. The reversal of 643476419 is 914674346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643476419 - 2⁴ = 643476403 is a prime.

It is a super-2 number, since 2×643476419² = 828123803618127122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643476419.

It is not a weakly prime, because it can be changed into another prime (643476499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321738209 + 321738210.

It is an arithmetic number, because the mean of its divisors is an integer number (321738210).

Almost surely, 2^643476419 is an apocalyptic number.

643476419 is a deficient number, since it is larger than the sum of its proper divisors (1).

643476419 is an equidigital number, since it uses as much as digits as its factorization.

643476419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 44.

The square root of 643476419 is about 25366.8369924198. The cubic root of 643476419 is about 863.3314171216.

The spelling of 643476419 in words is "six hundred forty-three million, four hundred seventy-six thousand, four hundred nineteen".