57145521851 has 4 divisors (see below), whose sum is σ = 62340569304. Its totient is φ = 51950474400.

The previous prime is 57145521803. The next prime is 57145521857. The reversal of 57145521851 is 15812554175.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-57145521851 is a prime.

It is a super-2 number, since 2×57145521851² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57145521857) 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, 2597523710 + ... + 2597523731.

It is an arithmetic number, because the mean of its divisors is an integer number (15585142326).

Almost surely, 2^57145521851 is an apocalyptic number.

57145521851 is a deficient number, since it is larger than the sum of its proper divisors (5195047453).

57145521851 is a wasteful number, since it uses less digits than its factorization.

57145521851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5195047452.

The product of its digits is 280000, while the sum is 44.

The spelling of 57145521851 in words is "fifty-seven billion, one hundred forty-five million, five hundred twenty-one thousand, eight hundred fifty-one".