51156556551 has 24 divisors (see below), whose sum is σ = 74965438080. Its totient is φ = 33609718800.

The previous prime is 51156556511. The next prime is 51156556573. The reversal of 51156556551 is 15565565115.

It is not a de Polignac number, because 51156556551 - 2¹⁷ = 51156425479 is a prime.

It is a super-2 number, since 2×51156556551² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51156556497 and 51156556506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51156556511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1606656 + ... + 1638186.

It is an arithmetic number, because the mean of its divisors is an integer number (3123559920).

Almost surely, 2^51156556551 is an apocalyptic number.

51156556551 is a deficient number, since it is larger than the sum of its proper divisors (23808881529).

51156556551 is a wasteful number, since it uses less digits than its factorization.

51156556551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34147 (or 34144 counting only the distinct ones).

The product of its digits is 562500, while the sum is 45.

The spelling of 51156556551 in words is "fifty-one billion, one hundred fifty-six million, five hundred fifty-six thousand, five hundred fifty-one".