51630025571 has 4 divisors (see below), whose sum is σ = 51633465072. Its totient is φ = 51626586072.

The previous prime is 51630025501. The next prime is 51630025613. The reversal of 51630025571 is 17552003615.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51630025571 is a prime.

It is a super-2 number, since 2×51630025571² (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 (51630025501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1697135 + ... + 1727288.

It is an arithmetic number, because the mean of its divisors is an integer number (12908366268).

Almost surely, 2^51630025571 is an apocalyptic number.

51630025571 is a deficient number, since it is larger than the sum of its proper divisors (3439501).

51630025571 is a wasteful number, since it uses less digits than its factorization.

51630025571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3439500.

The product of its (nonzero) digits is 31500, while the sum is 35.

The spelling of 51630025571 in words is "fifty-one billion, six hundred thirty million, twenty-five thousand, five hundred seventy-one".