51720935355 has 12 divisors (see below), whose sum is σ = 89649621360. Its totient is φ = 27584498832.

The previous prime is 51720935347. The next prime is 51720935359. The reversal of 51720935355 is 55353902715.

51720935355 is a `hidden beast` number, since 5 + 1 + 7 + 20 + 93 + 535 + 5 = 666.

It is not a de Polignac number, because 51720935355 - 2³ = 51720935347 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1149354119 = 51720935355 / (5 + 1 + 7 + 2 + 0 + 9 + 3 + 5 + 3 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 51720935355.

It is not an unprimeable number, because it can be changed into a prime (51720935359) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 574677015 + ... + 574677104.

It is an arithmetic number, because the mean of its divisors is an integer number (7470801780).

Almost surely, 2^51720935355 is an apocalyptic number.

51720935355 is a deficient number, since it is larger than the sum of its proper divisors (37928686005).

51720935355 is a wasteful number, since it uses less digits than its factorization.

51720935355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149354130 (or 1149354127 counting only the distinct ones).

The product of its (nonzero) digits is 708750, while the sum is 45.

The spelling of 51720935355 in words is "fifty-one billion, seven hundred twenty million, nine hundred thirty-five thousand, three hundred fifty-five".