6631621253 has 4 divisors (see below), whose sum is σ = 6682244448. Its totient is φ = 6580998060.

The previous prime is 6631621193. The next prime is 6631621289. The reversal of 6631621253 is 3521261366.

6631621253 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6631621253 - 2⁶ = 6631621189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6631621853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25311401 + ... + 25311662.

It is an arithmetic number, because the mean of its divisors is an integer number (1670561112).

Almost surely, 2^6631621253 is an apocalyptic number.

It is an amenable number.

6631621253 is a deficient number, since it is larger than the sum of its proper divisors (50623195).

6631621253 is a wasteful number, since it uses less digits than its factorization.

6631621253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50623194.

The product of its digits is 38880, while the sum is 35.

The square root of 6631621253 is about 81434.7668566688. The cubic root of 6631621253 is about 1878.7683623223.

The spelling of 6631621253 in words is "six billion, six hundred thirty-one million, six hundred twenty-one thousand, two hundred fifty-three".