51117000263 has 6 divisors (see below), whose sum is σ = 59462633016. Its totient is φ = 43814571612.

The previous prime is 51117000257. The next prime is 51117000269. The reversal of 51117000263 is 36200071115.

It is an interprime number because it is at equal distance from previous prime (51117000257) and next prime (51117000269).

It is not a de Polignac number, because 51117000263 - 2¹² = 51116996167 is a prime.

It is a super-2 number, since 2×51117000263² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51117000269) 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, 521601995 + ... + 521602092.

It is an arithmetic number, because the mean of its divisors is an integer number (9910438836).

Almost surely, 2^51117000263 is an apocalyptic number.

51117000263 is a deficient number, since it is larger than the sum of its proper divisors (8345632753).

51117000263 is a wasteful number, since it uses less digits than its factorization.

51117000263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043204101 (or 1043204094 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 26.

Adding to 51117000263 its reverse (36200071115), we get a palindrome (87317071378).

The spelling of 51117000263 in words is "fifty-one billion, one hundred seventeen million, two hundred sixty-three", and thus it is an aban number.