6344641657 has 4 divisors (see below), whose sum is σ = 6349052160. Its totient is φ = 6340231156.

The previous prime is 6344641651. The next prime is 6344641679. The reversal of 6344641657 is 7561464436.

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 a de Polignac number, because none of the positive numbers 2^k-6344641657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6344641651) 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, 2203093 + ... + 2205970.

It is an arithmetic number, because the mean of its divisors is an integer number (1587263040).

Almost surely, 2^6344641657 is an apocalyptic number.

It is an amenable number.

6344641657 is a deficient number, since it is larger than the sum of its proper divisors (4410503).

6344641657 is a wasteful number, since it uses less digits than its factorization.

6344641657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4410502.

The product of its digits is 1451520, while the sum is 46.

The square root of 6344641657 is about 79653.2589226580. The cubic root of 6344641657 is about 1851.2668855342.

The spelling of 6344641657 in words is "six billion, three hundred forty-four million, six hundred forty-one thousand, six hundred fifty-seven".