47779731921 has 8 divisors (see below), whose sum is σ = 63707331520. Its totient is φ = 31852643472.

The previous prime is 47779731919. The next prime is 47779731929. The reversal of 47779731921 is 12913797774.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 47779731921 - 2¹ = 47779731919 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (47779731929) 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, 249231 + ... + 397083.

It is an arithmetic number, because the mean of its divisors is an integer number (7963416440).

Almost surely, 2^47779731921 is an apocalyptic number.

It is an amenable number.

47779731921 is a deficient number, since it is larger than the sum of its proper divisors (15927599599).

47779731921 is a wasteful number, since it uses less digits than its factorization.

47779731921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255575.

The product of its digits is 4667544, while the sum is 57.

The spelling of 47779731921 in words is "forty-seven billion, seven hundred seventy-nine million, seven hundred thirty-one thousand, nine hundred twenty-one".