2155434320511 has 6 divisors (see below), whose sum is σ = 3113405129640. Its totient is φ = 1436956213668.

The previous prime is 2155434320483. The next prime is 2155434320581. The reversal of 2155434320511 is 1150234345512.

2155434320511 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 434 + 3 + 205 + 11 = 666.

It is not a de Polignac number, because 2155434320511 - 2⁶ = 2155434320447 is a prime.

It is a super-2 number, since 2×2155434320511² (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 (2155434320581) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119746351131 + ... + 119746351148.

It is an arithmetic number, because the mean of its divisors is an integer number (518900854940).

Almost surely, 2^{2155434320511} is an apocalyptic number.

2155434320511 is a deficient number, since it is larger than the sum of its proper divisors (957970809129).

2155434320511 is a wasteful number, since it uses less digits than its factorization.

2155434320511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239492702285 (or 239492702282 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 2155434320511 in words is "two trillion, one hundred fifty-five billion, four hundred thirty-four million, three hundred twenty thousand, five hundred eleven".