51381356544750 has 64 divisors (see below), whose sum is σ = 128249195892480. Its totient is φ = 13701552989600.

The previous prime is 51381356544737. The next prime is 51381356544751. The reversal of 51381356544750 is 5744565318315.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51381356544751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86002561 + ... + 86597939.

It is an arithmetic number, because the mean of its divisors is an integer number (2003893685820).

Almost surely, 2^{51381356544750} is an apocalyptic number.

51381356544750 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51381356544750 is an abundant number, since it is smaller than the sum of its proper divisors (76867839347730).

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

51381356544750 is a wasteful number, since it uses less digits than its factorization.

51381356544750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710466 (or 710456 counting only the distinct ones).

The product of its (nonzero) digits is 30240000, while the sum is 57.

It can be divided in two parts, 513813565 and 44750, that added together give a palindrome (513858315).

The spelling of 51381356544750 in words is "fifty-one trillion, three hundred eighty-one billion, three hundred fifty-six million, five hundred forty-four thousand, seven hundred fifty".