51571728849 has 16 divisors (see below), whose sum is σ = 69282933120. Its totient is φ = 34120974720.

The previous prime is 51571728787. The next prime is 51571728889. The reversal of 51571728849 is 94882717515.

It is a happy number.

It is not a de Polignac number, because 51571728849 - 2⁷ = 51571728721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51571728889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1723284 + ... + 1752954.

It is an arithmetic number, because the mean of its divisors is an integer number (4330183320).

Almost surely, 2^51571728849 is an apocalyptic number.

It is an amenable number.

51571728849 is a deficient number, since it is larger than the sum of its proper divisors (17711204271).

51571728849 is a wasteful number, since it uses less digits than its factorization.

51571728849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34040.

The product of its digits is 5644800, while the sum is 57.

The spelling of 51571728849 in words is "fifty-one billion, five hundred seventy-one million, seven hundred twenty-eight thousand, eight hundred forty-nine".