51128521763 has 8 divisors (see below), whose sum is σ = 56288282160. Its totient is φ = 46054046880.

The previous prime is 51128521753. The next prime is 51128521781. The reversal of 51128521763 is 36712582115.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51128521763 - 2⁴ = 51128521747 is a prime.

It is a super-4 number, since 4×51128521763⁴ (a number of 44 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 51128521763.

It is not an unprimeable number, because it can be changed into a prime (51128521753) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21320120 + ... + 21322517.

It is an arithmetic number, because the mean of its divisors is an integer number (7036035270).

Almost surely, 2^51128521763 is an apocalyptic number.

51128521763 is a deficient number, since it is larger than the sum of its proper divisors (5159760397).

51128521763 is a wasteful number, since it uses less digits than its factorization.

51128521763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42642757.

The product of its digits is 100800, while the sum is 41.

The spelling of 51128521763 in words is "fifty-one billion, one hundred twenty-eight million, five hundred twenty-one thousand, seven hundred sixty-three".