51816005551 has 2 divisors, whose sum is σ = 51816005552. Its totient is φ = 51816005550.

The previous prime is 51816005531. The next prime is 51816005557. The reversal of 51816005551 is 15550061815.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51816005551 - 2²⁷ = 51681787823 is a prime.

It is a super-2 number, since 2×51816005551² (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 51816005551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51816005557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25908002775 + 25908002776.

It is an arithmetic number, because the mean of its divisors is an integer number (25908002776).

Almost surely, 2^51816005551 is an apocalyptic number.

51816005551 is a deficient number, since it is larger than the sum of its proper divisors (1).

51816005551 is an equidigital number, since it uses as much as digits as its factorization.

51816005551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30000, while the sum is 37.

The spelling of 51816005551 in words is "fifty-one billion, eight hundred sixteen million, five thousand, five hundred fifty-one".