51655478168 has 48 divisors (see below), whose sum is σ = 112801928400. Its totient is φ = 22111535040.

The previous prime is 51655478131. The next prime is 51655478183. The reversal of 51655478168 is 86187455615.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250358 + ... + 407418.

It is an arithmetic number, because the mean of its divisors is an integer number (2350040175).

Almost surely, 2^51655478168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51655478168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56400964200).

51655478168 is an abundant number, since it is smaller than the sum of its proper divisors (61146450232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51655478168 is a wasteful number, since it uses less digits than its factorization.

51655478168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157920 (or 157909 counting only the distinct ones).

The product of its digits is 8064000, while the sum is 56.

It can be divided in two parts, 5165547 and 8168, that added together give a palindrome (5173715).

The spelling of 51655478168 in words is "fifty-one billion, six hundred fifty-five million, four hundred seventy-eight thousand, one hundred sixty-eight".