51556550651 has 2 divisors, whose sum is σ = 51556550652. Its totient is φ = 51556550650.

The previous prime is 51556550603. The next prime is 51556550653. The reversal of 51556550651 is 15605565515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51556550651 - 2¹⁸ = 51556288507 is a prime.

It is a super-3 number, since 3×51556550651³ (a number of 33 digits) contains 333 as substring.

Together with 51556550653, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51556550653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25778275325 + 25778275326.

It is an arithmetic number, because the mean of its divisors is an integer number (25778275326).

Almost surely, 2^51556550651 is an apocalyptic number.

51556550651 is a deficient number, since it is larger than the sum of its proper divisors (1).

51556550651 is an equidigital number, since it uses as much as digits as its factorization.

51556550651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 562500, while the sum is 44.

The spelling of 51556550651 in words is "fifty-one billion, five hundred fifty-six million, five hundred fifty thousand, six hundred fifty-one".