6406644571 has 4 divisors (see below), whose sum is σ = 6410971944. Its totient is φ = 6402317200.

The previous prime is 6406644557. The next prime is 6406644583. The reversal of 6406644571 is 1754466046.

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 6406644571 - 2⁵ = 6406644539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6406644511) 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, 2161465 + ... + 2164426.

It is an arithmetic number, because the mean of its divisors is an integer number (1602742986).

Almost surely, 2^6406644571 is an apocalyptic number.

6406644571 is a deficient number, since it is larger than the sum of its proper divisors (4327373).

6406644571 is a wasteful number, since it uses less digits than its factorization.

6406644571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4327372.

The product of its (nonzero) digits is 483840, while the sum is 43.

The square root of 6406644571 is about 80041.5177954541. The cubic root of 6406644571 is about 1857.2778396825.

The spelling of 6406644571 in words is "six billion, four hundred six million, six hundred forty-four thousand, five hundred seventy-one".