6629653921 has 8 divisors (see below), whose sum is σ = 7331423904. Its totient is φ = 5944396320.

The previous prime is 6629653913. The next prime is 6629653991. The reversal of 6629653921 is 1293569266.

It is a happy number.

6629653921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6629653921 - 2³ = 6629653913 is a prime.

It is a super-2 number, since 2×6629653921² = 87904622224461348482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6629653991) 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, 4127251 + ... + 4128856.

It is an arithmetic number, because the mean of its divisors is an integer number (916427988).

Almost surely, 2^6629653921 is an apocalyptic number.

It is an amenable number.

6629653921 is a deficient number, since it is larger than the sum of its proper divisors (701769983).

6629653921 is a wasteful number, since it uses less digits than its factorization.

6629653921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8256191.

The product of its digits is 1049760, while the sum is 49.

The square root of 6629653921 is about 81422.6867709485. The cubic root of 6629653921 is about 1878.5825592565.

The spelling of 6629653921 in words is "six billion, six hundred twenty-nine million, six hundred fifty-three thousand, nine hundred twenty-one".