47644945921 has 4 divisors (see below), whose sum is σ = 47651216832. Its totient is φ = 47638675012.

The previous prime is 47644945903. The next prime is 47644945937. The reversal of 47644945921 is 12954944674.

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 47644945921 - 2⁷ = 47644945793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47644945951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3124045 + ... + 3139258.

It is an arithmetic number, because the mean of its divisors is an integer number (11912804208).

Almost surely, 2^47644945921 is an apocalyptic number.

It is an amenable number.

47644945921 is a deficient number, since it is larger than the sum of its proper divisors (6270911).

47644945921 is an equidigital number, since it uses as much as digits as its factorization.

47644945921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6270910.

The product of its digits is 8709120, while the sum is 55.

The spelling of 47644945921 in words is "forty-seven billion, six hundred forty-four million, nine hundred forty-five thousand, nine hundred twenty-one".