51156521571 has 4 divisors (see below), whose sum is σ = 68208695432. Its totient is φ = 34104347712.

The previous prime is 51156521551. The next prime is 51156521609. The reversal of 51156521571 is 17512565115.

It is a happy number.

51156521571 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51156521571 - 2³⁵ = 16796783203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51156521551) 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, 8526086926 + ... + 8526086931.

It is an arithmetic number, because the mean of its divisors is an integer number (17052173858).

Almost surely, 2^51156521571 is an apocalyptic number.

51156521571 is a deficient number, since it is larger than the sum of its proper divisors (17052173861).

51156521571 is a wasteful number, since it uses less digits than its factorization.

51156521571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17052173860.

The product of its digits is 52500, while the sum is 39.

The spelling of 51156521571 in words is "fifty-one billion, one hundred fifty-six million, five hundred twenty-one thousand, five hundred seventy-one".