6633620641 has 4 divisors (see below), whose sum is σ = 6652628500. Its totient is φ = 6614612784.

The previous prime is 6633620633. The next prime is 6633620681. The reversal of 6633620641 is 1460263366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1460263366 = 2 ⋅730131683.

It can be written as a sum of positive squares in 2 ways, for example, as 4791408400 + 1842212241 = 69220^2 + 42921^2 .

It is a cyclic number.

It is not a de Polignac number, because 6633620641 - 2³ = 6633620633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6633620641.

It is not an unprimeable number, because it can be changed into a prime (6633620681) 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, 9503406 + ... + 9504103.

It is an arithmetic number, because the mean of its divisors is an integer number (1663157125).

Almost surely, 2^6633620641 is an apocalyptic number.

It is an amenable number.

6633620641 is a deficient number, since it is larger than the sum of its proper divisors (19007859).

6633620641 is a wasteful number, since it uses less digits than its factorization.

6633620641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19007858.

The product of its (nonzero) digits is 93312, while the sum is 37.

The square root of 6633620641 is about 81447.0419413744. The cubic root of 6633620641 is about 1878.9571552448.

The spelling of 6633620641 in words is "six billion, six hundred thirty-three million, six hundred twenty thousand, six hundred forty-one".