51222727657 has 4 divisors (see below), whose sum is σ = 51243409476. Its totient is φ = 51202045840.

The previous prime is 51222727639. The next prime is 51222727697. The reversal of 51222727657 is 75672722215.

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 42820438761 + 8402288896 = 206931^2 + 91664^2 .

It is a cyclic number.

It is not a de Polignac number, because 51222727657 - 2¹⁹ = 51222203369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51222727697) 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, 10337194 + ... + 10342147.

It is an arithmetic number, because the mean of its divisors is an integer number (12810852369).

Almost surely, 2^51222727657 is an apocalyptic number.

It is an amenable number.

51222727657 is a deficient number, since it is larger than the sum of its proper divisors (20681819).

51222727657 is a wasteful number, since it uses less digits than its factorization.

51222727657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20681818.

The product of its digits is 823200, while the sum is 46.

The spelling of 51222727657 in words is "fifty-one billion, two hundred twenty-two million, seven hundred twenty-seven thousand, six hundred fifty-seven".