51568747297 has 4 divisors (see below), whose sum is σ = 51571568196. Its totient is φ = 51565926400.

The previous prime is 51568747289. The next prime is 51568747313. The reversal of 51568747297 is 79274786515.

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 15624000016 + 35944747281 = 124996^2 + 189591^2 .

It is a cyclic number.

It is not a de Polignac number, because 51568747297 - 2³ = 51568747289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51568747397) 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, 1382848 + ... + 1419649.

It is an arithmetic number, because the mean of its divisors is an integer number (12892892049).

Almost surely, 2^51568747297 is an apocalyptic number.

It is an amenable number.

51568747297 is a deficient number, since it is larger than the sum of its proper divisors (2820899).

51568747297 is a wasteful number, since it uses less digits than its factorization.

51568747297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820898.

The product of its digits is 29635200, while the sum is 61.

The spelling of 51568747297 in words is "fifty-one billion, five hundred sixty-eight million, seven hundred forty-seven thousand, two hundred ninety-seven".