51263121363400 has 24 divisors (see below), whose sum is σ = 119186757170370. Its totient is φ = 20505248545280.

The previous prime is 51263121363383. The next prime is 51263121363439. The reversal of 51263121363400 is 436312136215.

It can be written as a sum of positive squares in 3 ways, for example, as 42201419972644 + 9061701390756 = 6496262^2 + 3010266^2 .

It is a super-2 number, since 2×51263121363400² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51263121363400.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 128157803209 + ... + 128157803608.

Almost surely, 2^{51263121363400} is an apocalyptic number.

51263121363400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51263121363400 is an abundant number, since it is smaller than the sum of its proper divisors (67923635806970).

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

51263121363400 is a wasteful number, since it uses less digits than its factorization.

51263121363400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256315606833 (or 256315606824 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

Adding to 51263121363400 its reverse (436312136215), we get a palindrome (51699433499615).

The spelling of 51263121363400 in words is "fifty-one trillion, two hundred sixty-three billion, one hundred twenty-one million, three hundred sixty-three thousand, four hundred".