2129355655551 has 6 divisors (see below), whose sum is σ = 3075735946920. Its totient is φ = 1419570437028.

The previous prime is 2129355655541. The next prime is 2129355655573. The reversal of 2129355655551 is 1555565539212.

2129355655551 is a `hidden beast` number, since 2 + 1 + 2 + 9 + 35 + 5 + 6 + 55 + 551 = 666.

It is not a de Polignac number, because 2129355655551 - 2³³ = 2120765720959 is a prime.

It is a super-2 number, since 2×2129355655551² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129355655541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 118297536411 + ... + 118297536428.

It is an arithmetic number, because the mean of its divisors is an integer number (512622657820).

Almost surely, 2^{2129355655551} is an apocalyptic number.

2129355655551 is a deficient number, since it is larger than the sum of its proper divisors (946380291369).

2129355655551 is a wasteful number, since it uses less digits than its factorization.

2129355655551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236595072845 (or 236595072842 counting only the distinct ones).

The product of its digits is 10125000, while the sum is 54.

The spelling of 2129355655551 in words is "two trillion, one hundred twenty-nine billion, three hundred fifty-five million, six hundred fifty-five thousand, five hundred fifty-one".