51263620173 has 64 divisors (see below), whose sum is σ = 84201223680. Its totient is φ = 30660056064.

The previous prime is 51263620169. The next prime is 51263620183. The reversal of 51263620173 is 37102636215.

51263620173 is a `hidden beast` number, since 5 + 1 + 2 + 636 + 2 + 0 + 17 + 3 = 666.

It is not a de Polignac number, because 51263620173 - 2² = 51263620169 is a prime.

It is a super-2 number, since 2×51263620173² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51263620183) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3084915 + ... + 3101487.

It is an arithmetic number, because the mean of its divisors is an integer number (1315644120).

Almost surely, 2^51263620173 is an apocalyptic number.

It is an amenable number.

51263620173 is a deficient number, since it is larger than the sum of its proper divisors (32937603507).

51263620173 is a wasteful number, since it uses less digits than its factorization.

51263620173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16915 (or 16909 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The spelling of 51263620173 in words is "fifty-one billion, two hundred sixty-three million, six hundred twenty thousand, one hundred seventy-three".