51615956929 has 2 divisors, whose sum is σ = 51615956930. Its totient is φ = 51615956928.

The previous prime is 51615956927. The next prime is 51615956941. The reversal of 51615956929 is 92965951615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51329433600 + 286523329 = 226560^2 + 16927^2 .

It is a cyclic number.

It is not a de Polignac number, because 51615956929 - 2¹ = 51615956927 is a prime.

It is a super-2 number, since 2×51615956929² (a number of 22 digits) contains 22 as substring.

Together with 51615956927, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51615956927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25807978464 + 25807978465.

It is an arithmetic number, because the mean of its divisors is an integer number (25807978465).

Almost surely, 2^51615956929 is an apocalyptic number.

It is an amenable number.

51615956929 is a deficient number, since it is larger than the sum of its proper divisors (1).

51615956929 is an equidigital number, since it uses as much as digits as its factorization.

51615956929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6561000, while the sum is 58.

The spelling of 51615956929 in words is "fifty-one billion, six hundred fifteen million, nine hundred fifty-six thousand, nine hundred twenty-nine".