51117950069 has 2 divisors, whose sum is σ = 51117950070. Its totient is φ = 51117950068.

The previous prime is 51117950033. The next prime is 51117950099. The reversal of 51117950069 is 96005971115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43540247569 + 7577702500 = 208663^2 + 87050^2 .

It is a cyclic number.

It is not a de Polignac number, because 51117950069 - 2¹⁶ = 51117884533 is a prime.

It is a super-2 number, since 2×51117950069² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51117950099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25558975034 + 25558975035.

It is an arithmetic number, because the mean of its divisors is an integer number (25558975035).

Almost surely, 2^51117950069 is an apocalyptic number.

It is an amenable number.

51117950069 is a deficient number, since it is larger than the sum of its proper divisors (1).

51117950069 is an equidigital number, since it uses as much as digits as its factorization.

51117950069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 85050, while the sum is 44.

The spelling of 51117950069 in words is "fifty-one billion, one hundred seventeen million, nine hundred fifty thousand, sixty-nine".