6681329553 has 8 divisors (see below), whose sum is σ = 8955081216. Its totient is φ = 4430898800.

The previous prime is 6681329539. The next prime is 6681329561. The reversal of 6681329553 is 3559231866.

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 6681329553 - 2¹⁰ = 6681328529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6681329533) 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, 5829558 + ... + 5830703.

It is an arithmetic number, because the mean of its divisors is an integer number (1119385152).

Almost surely, 2^6681329553 is an apocalyptic number.

It is an amenable number.

6681329553 is a deficient number, since it is larger than the sum of its proper divisors (2273751663).

6681329553 is a wasteful number, since it uses less digits than its factorization.

6681329553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11660455.

The product of its digits is 1166400, while the sum is 48.

The square root of 6681329553 is about 81739.4002485949. The cubic root of 6681329553 is about 1883.4508778142.

The spelling of 6681329553 in words is "six billion, six hundred eighty-one million, three hundred twenty-nine thousand, five hundred fifty-three".