51120354555 has 16 divisors (see below), whose sum is σ = 90880630560. Its totient is φ = 27264189024.

The previous prime is 51120354457. The next prime is 51120354557. The reversal of 51120354555 is 55545302115.

51120354555 is a `hidden beast` number, since 51 + 1 + 2 + 0 + 3 + 54 + 555 = 666.

It is not a de Polignac number, because 51120354555 - 2⁷ = 51120354427 is a prime.

It is a super-2 number, since 2×51120354555² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51120354557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189334512 + ... + 189334781.

It is an arithmetic number, because the mean of its divisors is an integer number (5680039410).

Almost surely, 2^51120354555 is an apocalyptic number.

51120354555 is a deficient number, since it is larger than the sum of its proper divisors (39760276005).

51120354555 is a wasteful number, since it uses less digits than its factorization.

51120354555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378669307 (or 378669301 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 36.

The spelling of 51120354555 in words is "fifty-one billion, one hundred twenty million, three hundred fifty-four thousand, five hundred fifty-five".