51768535729 has 15 divisors (see below), whose sum is σ = 53412457593. Its totient is φ = 50175164148.

The previous prime is 51768535673. The next prime is 51768535747. The reversal of 51768535729 is 92753586715.

It is a happy number.

The square root of 51768535729 is 227527.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 51768535729 - 2¹¹ = 51768533681 is a prime.

It is a super-2 number, since 2×51768535729² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

Its product of digits (15876000) is a multiple of the sum of its prime divisors (150).

It is not an unprimeable number, because it can be changed into a prime (51768535799) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 502607092 + ... + 502607194.

Almost surely, 2^51768535729 is an apocalyptic number.

51768535729 is the 227527-th square number.

51768535729 is the 113764-th centered octagonal number.

It is an amenable number.

51768535729 is a deficient number, since it is larger than the sum of its proper divisors (1643921864).

51768535729 is an frugal number, since it uses more digits than its factorization.

51768535729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 150 counting only the distinct ones).

The product of its digits is 15876000, while the sum is 58.

The spelling of 51768535729 in words is "fifty-one billion, seven hundred sixty-eight million, five hundred thirty-five thousand, seven hundred twenty-nine".