51261874879 has 2 divisors, whose sum is σ = 51261874880. Its totient is φ = 51261874878.

The previous prime is 51261874843. The next prime is 51261874897. The reversal of 51261874879 is 97847816215.

Together with next prime (51261874897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51261874879 is a prime.

It is a super-2 number, since 2×51261874879² (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 (51261874819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25630937439 + 25630937440.

It is an arithmetic number, because the mean of its divisors is an integer number (25630937440).

Almost surely, 2^51261874879 is an apocalyptic number.

51261874879 is a deficient number, since it is larger than the sum of its proper divisors (1).

51261874879 is an equidigital number, since it uses as much as digits as its factorization.

51261874879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6773760, while the sum is 58.

The spelling of 51261874879 in words is "fifty-one billion, two hundred sixty-one million, eight hundred seventy-four thousand, eight hundred seventy-nine".