57147415721 has 4 divisors (see below), whose sum is σ = 62342635344. Its totient is φ = 51952196100.

The previous prime is 57147415649. The next prime is 57147415729. The reversal of 57147415721 is 12751474175.

It is a happy number.

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 57147415721 - 2³⁰ = 56073673897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57147415729) 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, 2597609795 + ... + 2597609816.

It is an arithmetic number, because the mean of its divisors is an integer number (15585658836).

Almost surely, 2^57147415721 is an apocalyptic number.

It is an amenable number.

57147415721 is a deficient number, since it is larger than the sum of its proper divisors (5195219623).

57147415721 is a wasteful number, since it uses less digits than its factorization.

57147415721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5195219622.

The product of its digits is 274400, while the sum is 44.

Adding to 57147415721 its reverse (12751474175), we get a palindrome (69898889896).

The spelling of 57147415721 in words is "fifty-seven billion, one hundred forty-seven million, four hundred fifteen thousand, seven hundred twenty-one".