51205235357 has 2 divisors, whose sum is σ = 51205235358. Its totient is φ = 51205235356.

The previous prime is 51205235299. The next prime is 51205235399. The reversal of 51205235357 is 75353250215.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25751904676 + 25453330681 = 160474^2 + 159541^2 .

It is a cyclic number.

It is not a de Polignac number, because 51205235357 - 2²² = 51201041053 is a prime.

It is a super-2 number, since 2×51205235357² (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 51205235357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51205232357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25602617678 + 25602617679.

It is an arithmetic number, because the mean of its divisors is an integer number (25602617679).

Almost surely, 2^51205235357 is an apocalyptic number.

It is an amenable number.

51205235357 is a deficient number, since it is larger than the sum of its proper divisors (1).

51205235357 is an equidigital number, since it uses as much as digits as its factorization.

51205235357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157500, while the sum is 38.

The spelling of 51205235357 in words is "fifty-one billion, two hundred five million, two hundred thirty-five thousand, three hundred fifty-seven".