51775657669 has 2 divisors, whose sum is σ = 51775657670. Its totient is φ = 51775657668.

The previous prime is 51775657649. The next prime is 51775657741. The reversal of 51775657669 is 96675657715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34174328769 + 17601328900 = 184863^2 + 132670^2 .

It is a cyclic number.

It is not a de Polignac number, because 51775657669 - 2²³ = 51767269061 is a prime.

It is a super-2 number, since 2×51775657669² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51775657669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51775657649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25887828834 + 25887828835.

It is an arithmetic number, because the mean of its divisors is an integer number (25887828835).

Almost surely, 2^51775657669 is an apocalyptic number.

It is an amenable number.

51775657669 is a deficient number, since it is larger than the sum of its proper divisors (1).

51775657669 is an equidigital number, since it uses as much as digits as its factorization.

51775657669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 83349000, while the sum is 64.

The spelling of 51775657669 in words is "fifty-one billion, seven hundred seventy-five million, six hundred fifty-seven thousand, six hundred sixty-nine".