643460651411 has 4 divisors (see below), whose sum is σ = 650094266472. Its totient is φ = 636827036352.

The previous prime is 643460651377. The next prime is 643460651413. The reversal of 643460651411 is 114156064346.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 114156064346 = 2 ⋅57078032173.

It is a cyclic number.

It is not a de Polignac number, because 643460651411 - 2⁶ = 643460651347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643460651413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3316807385 + ... + 3316807578.

It is an arithmetic number, because the mean of its divisors is an integer number (162523566618).

Almost surely, 2^643460651411 is an apocalyptic number.

643460651411 is a deficient number, since it is larger than the sum of its proper divisors (6633615061).

643460651411 is an equidigital number, since it uses as much as digits as its factorization.

643460651411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6633615060.

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 643460651411 in words is "six hundred forty-three billion, four hundred sixty million, six hundred fifty-one thousand, four hundred eleven".