51917768136 has 48 divisors (see below), whose sum is σ = 151426826460. Its totient is φ = 15974697600.

The previous prime is 51917768099. The next prime is 51917768159. The reversal of 51917768136 is 63186771915.

51917768136 is a `hidden beast` number, since 519 + 17 + 7 + 6 + 81 + 36 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 51560784900 + 356983236 = 227070^2 + 18894^2 .

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, 27732915 + ... + 27734786.

Almost surely, 2^51917768136 is an apocalyptic number.

It is an amenable number.

51917768136 is an abundant number, since it is smaller than the sum of its proper divisors (99509058324).

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

51917768136 is a wasteful number, since it uses less digits than its factorization.

51917768136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55467726 (or 55467719 counting only the distinct ones).

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

The spelling of 51917768136 in words is "fifty-one billion, nine hundred seventeen million, seven hundred sixty-eight thousand, one hundred thirty-six".