51368149729 has 4 divisors (see below), whose sum is σ = 55319545876. Its totient is φ = 47416753584.

The previous prime is 51368149711. The next prime is 51368149787. The reversal of 51368149729 is 92794186315.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19595800225 + 31772349504 = 139985^2 + 178248^2 .

It is a cyclic number.

It is not a de Polignac number, because 51368149729 - 2¹³ = 51368141537 is a prime.

It is a super-3 number, since 3×51368149729³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51368149729.

It is not an unprimeable number, because it can be changed into a prime (51368149709) 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, 1975698054 + ... + 1975698079.

It is an arithmetic number, because the mean of its divisors is an integer number (13829886469).

Almost surely, 2^51368149729 is an apocalyptic number.

It is an amenable number.

51368149729 is a deficient number, since it is larger than the sum of its proper divisors (3951396147).

51368149729 is a wasteful number, since it uses less digits than its factorization.

51368149729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3951396146.

The product of its digits is 3265920, while the sum is 55.

The spelling of 51368149729 in words is "fifty-one billion, three hundred sixty-eight million, one hundred forty-nine thousand, seven hundred twenty-nine".