51767819136 has 144 divisors (see below), whose sum is σ = 163741348680. Its totient is φ = 15687175680.

The previous prime is 51767819113. The next prime is 51767819137. The reversal of 51767819136 is 63191876715.

51767819136 is a `hidden beast` number, since 517 + 6 + 7 + 8 + 1 + 91 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51767819137) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 46300 + ... + 325083.

Almost surely, 2^51767819136 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 51767819136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81870674340).

51767819136 is an abundant number, since it is smaller than the sum of its proper divisors (111973529544).

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

51767819136 is a wasteful number, since it uses less digits than its factorization.

51767819136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371425 (or 371399 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The spelling of 51767819136 in words is "fifty-one billion, seven hundred sixty-seven million, eight hundred nineteen thousand, one hundred thirty-six".