51551000163 has 24 divisors (see below), whose sum is σ = 80284171968. Its totient is φ = 31686613632.

The previous prime is 51551000161. The next prime is 51551000191. The reversal of 51551000163 is 36100015515.

51551000163 is a `hidden beast` number, since 51 + 551 + 0 + 0 + 0 + 1 + 63 = 666.

It is not a de Polignac number, because 51551000163 - 2¹ = 51551000161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51551000161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156795 + ... + 357332.

It is an arithmetic number, because the mean of its divisors is an integer number (3345173832).

Almost surely, 2^51551000163 is an apocalyptic number.

51551000163 is a deficient number, since it is larger than the sum of its proper divisors (28733171805).

51551000163 is a wasteful number, since it uses less digits than its factorization.

51551000163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515003 (or 515000 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

Adding to 51551000163 its reverse (36100015515), we get a palindrome (87651015678).

The spelling of 51551000163 in words is "fifty-one billion, five hundred fifty-one million, one hundred sixty-three", and thus it is an aban number.