6425623643 has 4 divisors (see below), whose sum is σ = 6704998608. Its totient is φ = 6146248680.

The previous prime is 6425623639. The next prime is 6425623657. The reversal of 6425623643 is 3463265246.

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 6425623643 - 2² = 6425623639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6425623643.

It is not an unprimeable number, because it can be changed into a prime (6425623693) 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, 139687448 + ... + 139687493.

It is an arithmetic number, because the mean of its divisors is an integer number (1676249652).

Almost surely, 2^6425623643 is an apocalyptic number.

6425623643 is a deficient number, since it is larger than the sum of its proper divisors (279374965).

6425623643 is a wasteful number, since it uses less digits than its factorization.

6425623643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279374964.

The product of its digits is 622080, while the sum is 41.

The square root of 6425623643 is about 80159.9877931627. The cubic root of 6425623643 is about 1859.1100343130.

Adding to 6425623643 its reverse (3463265246), we get a palindrome (9888888889).

The spelling of 6425623643 in words is "six billion, four hundred twenty-five million, six hundred twenty-three thousand, six hundred forty-three".