643651411 has 8 divisors (see below), whose sum is σ = 695026640. Its totient is φ = 592542432.

The previous prime is 643651387. The next prime is 643651453. The reversal of 643651411 is 114156346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643651411 - 2¹³ = 643643219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643654411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61521 + ... + 71218.

It is an arithmetic number, because the mean of its divisors is an integer number (86878330).

Almost surely, 2^643651411 is an apocalyptic number.

643651411 is a deficient number, since it is larger than the sum of its proper divisors (51375229).

643651411 is a wasteful number, since it uses less digits than its factorization.

643651411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133125.

The product of its digits is 8640, while the sum is 31.

The square root of 643651411 is about 25370.2859857748. The cubic root of 643651411 is about 863.4096703899.

The spelling of 643651411 in words is "six hundred forty-three million, six hundred fifty-one thousand, four hundred eleven".