47572237721 has 4 divisors (see below), whose sum is σ = 48732536244. Its totient is φ = 46411939200.

The previous prime is 47572237717. The next prime is 47572237747. The reversal of 47572237721 is 12773227574.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26362393225 + 21209844496 = 162365^2 + 145636^2 .

It is a cyclic number.

It is not a de Polignac number, because 47572237721 - 2² = 47572237717 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 (47572237711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 580149200 + ... + 580149281.

It is an arithmetic number, because the mean of its divisors is an integer number (12183134061).

Almost surely, 2^47572237721 is an apocalyptic number.

47572237721 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

47572237721 is a deficient number, since it is larger than the sum of its proper divisors (1160298523).

47572237721 is a wasteful number, since it uses less digits than its factorization.

47572237721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160298522.

The product of its digits is 1152480, while the sum is 47.

The spelling of 47572237721 in words is "forty-seven billion, five hundred seventy-two million, two hundred thirty-seven thousand, seven hundred twenty-one".