51339865500 has 960 divisors, whose sum is σ = 212189193216. Its totient is φ = 10497600000.

The previous prime is 51339865463. The next prime is 51339865501. The reversal of 51339865500 is 556893315.

51339865500 is a `hidden beast` number, since 5 + 1 + 3 + 3 + 98 + 6 + 550 + 0 = 666.

51339865500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51339865501) by changing a digit.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 314968419 + ... + 314968581.

Almost surely, 2^51339865500 is an apocalyptic number.

51339865500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51339865500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106094596608).

51339865500 is an abundant number, since it is smaller than the sum of its proper divisors (160849327716).

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

51339865500 is a wasteful number, since it uses less digits than its factorization.

51339865500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 45.

The spelling of 51339865500 in words is "fifty-one billion, three hundred thirty-nine million, eight hundred sixty-five thousand, five hundred".