6403943953 has 4 divisors (see below), whose sum is σ = 6986120688. Its totient is φ = 5821767220.

The previous prime is 6403943929. The next prime is 6403943999. The reversal of 6403943953 is 3593493046.

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 6403943953 - 2¹³ = 6403935761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6403943353) 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, 291088351 + ... + 291088372.

It is an arithmetic number, because the mean of its divisors is an integer number (1746530172).

Almost surely, 2^6403943953 is an apocalyptic number.

It is an amenable number.

6403943953 is a deficient number, since it is larger than the sum of its proper divisors (582176735).

6403943953 is a wasteful number, since it uses less digits than its factorization.

6403943953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582176734.

The product of its (nonzero) digits is 1049760, while the sum is 46.

The square root of 6403943953 is about 80024.6459098695. The cubic root of 6403943953 is about 1857.0168344688.

The spelling of 6403943953 in words is "six billion, four hundred three million, nine hundred forty-three thousand, nine hundred fifty-three".