6640433953 has 8 divisors (see below), whose sum is σ = 6750887360. Its totient is φ = 6530032080.

The previous prime is 6640433941. The next prime is 6640433981. The reversal of 6640433953 is 3593340466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6640433953 - 2¹⁷ = 6640302881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6640433153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315988 + ... + 336346.

It is an arithmetic number, because the mean of its divisors is an integer number (843860920).

Almost surely, 2^6640433953 is an apocalyptic number.

It is an amenable number.

6640433953 is a deficient number, since it is larger than the sum of its proper divisors (110453407).

6640433953 is a wasteful number, since it uses less digits than its factorization.

6640433953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25767.

The product of its (nonzero) digits is 699840, while the sum is 43.

The square root of 6640433953 is about 81488.8578457202. The cubic root of 6640433953 is about 1879.6002199011.

The spelling of 6640433953 in words is "six billion, six hundred forty million, four hundred thirty-three thousand, nine hundred fifty-three".