51115651123 has 2 divisors, whose sum is σ = 51115651124. Its totient is φ = 51115651122.

The previous prime is 51115651121. The next prime is 51115651133. The reversal of 51115651123 is 32115651115.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51115651123 - 2¹ = 51115651121 is a prime.

It is a super-2 number, since 2×51115651123² (a number of 22 digits) contains 22 as substring.

Together with 51115651121, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51115651121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25557825561 + 25557825562.

It is an arithmetic number, because the mean of its divisors is an integer number (25557825562).

Almost surely, 2^51115651123 is an apocalyptic number.

51115651123 is a deficient number, since it is larger than the sum of its proper divisors (1).

51115651123 is an equidigital number, since it uses as much as digits as its factorization.

51115651123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4500, while the sum is 31.

The spelling of 51115651123 in words is "fifty-one billion, one hundred fifteen million, six hundred fifty-one thousand, one hundred twenty-three".