51551606511 has 6 divisors (see below), whose sum is σ = 74463431640. Its totient is φ = 34367737668.

The previous prime is 51551606507. The next prime is 51551606527. The reversal of 51551606511 is 11560615515.

It is a happy number.

51551606511 is a `hidden beast` number, since 51 + 551 + 6 + 0 + 6 + 51 + 1 = 666.

51551606511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51551606511 - 2² = 51551606507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51551606551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2863978131 + ... + 2863978148.

It is an arithmetic number, because the mean of its divisors is an integer number (12410571940).

Almost surely, 2^51551606511 is an apocalyptic number.

51551606511 is a deficient number, since it is larger than the sum of its proper divisors (22911825129).

51551606511 is a wasteful number, since it uses less digits than its factorization.

51551606511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5727956285 (or 5727956282 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 51551606511 in words is "fifty-one billion, five hundred fifty-one million, six hundred six thousand, five hundred eleven".