51005550505500 has 144 divisors (see below), whose sum is σ = 160908669981696. Its totient is φ = 13601213020800.

The previous prime is 51005550505499. The next prime is 51005550505501. The reversal of 51005550505500 is 550505550015.

It is a happy number.

51005550505500 is a `hidden beast` number, since 5 + 1 + 0 + 0 + 5 + 5 + 50 + 50 + 550 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (51005550505499) and next prime (51005550505501).

It is a super-2 number, since 2×51005550505500² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51005550505501) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 354766629 + ... + 354910371.

Almost surely, 2^{51005550505500} is an apocalyptic number.

51005550505500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51005550505500 is an abundant number, since it is smaller than the sum of its proper divisors (109903119476196).

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

51005550505500 is a wasteful number, since it uses less digits than its factorization.

51005550505500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222621 (or 222606 counting only the distinct ones).

The product of its (nonzero) digits is 78125, while the sum is 36.

The spelling of 51005550505500 in words is "fifty-one trillion, five billion, five hundred fifty million, five hundred five thousand, five hundred".