6343642561 has 4 divisors (see below), whose sum is σ = 6548276224. Its totient is φ = 6139008900.

The previous prime is 6343642541. The next prime is 6343642573. The reversal of 6343642561 is 1652463436.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6343642561 - 2¹⁵ = 6343609793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6343642511) 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, 102316785 + ... + 102316846.

It is an arithmetic number, because the mean of its divisors is an integer number (1637069056).

Almost surely, 2^6343642561 is an apocalyptic number.

It is an amenable number.

6343642561 is a deficient number, since it is larger than the sum of its proper divisors (204633663).

6343642561 is a wasteful number, since it uses less digits than its factorization.

6343642561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204633662.

The product of its digits is 311040, while the sum is 40.

The square root of 6343642561 is about 79646.9871432686. The cubic root of 6343642561 is about 1851.1697069209.

The spelling of 6343642561 in words is "six billion, three hundred forty-three million, six hundred forty-two thousand, five hundred sixty-one".