47631978721 has 4 divisors (see below), whose sum is σ = 47995581744. Its totient is φ = 47268375700.

The previous prime is 47631978697. The next prime is 47631978727. The reversal of 47631978721 is 12787913674.

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 47631978721 - 2²¹ = 47629881569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47631978727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181801315 + ... + 181801576.

It is an arithmetic number, because the mean of its divisors is an integer number (11998895436).

Almost surely, 2^47631978721 is an apocalyptic number.

It is an amenable number.

47631978721 is a deficient number, since it is larger than the sum of its proper divisors (363603023).

47631978721 is a wasteful number, since it uses less digits than its factorization.

47631978721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363603022.

The product of its digits is 3556224, while the sum is 55.

The spelling of 47631978721 in words is "forty-seven billion, six hundred thirty-one million, nine hundred seventy-eight thousand, seven hundred twenty-one".