643477711 has 4 divisors (see below), whose sum is σ = 643760632. Its totient is φ = 643194792.

The previous prime is 643477697. The next prime is 643477729. The reversal of 643477711 is 117774346.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 643477711 - 2¹⁵ = 643444943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643477741) 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, 138021 + ... + 142606.

It is an arithmetic number, because the mean of its divisors is an integer number (160940158).

Almost surely, 2^643477711 is an apocalyptic number.

643477711 is a deficient number, since it is larger than the sum of its proper divisors (282921).

643477711 is a wasteful number, since it uses less digits than its factorization.

643477711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282920.

The product of its digits is 98784, while the sum is 40.

The square root of 643477711 is about 25366.8624587275. The cubic root of 643477711 is about 863.3319949327.

The spelling of 643477711 in words is "six hundred forty-three million, four hundred seventy-seven thousand, seven hundred eleven".