2154111554501 has 2 divisors, whose sum is σ = 2154111554502. Its totient is φ = 2154111554500.

The previous prime is 2154111554447. The next prime is 2154111554503. The reversal of 2154111554501 is 1054551114512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2136786150625 + 17325403876 = 1461775^2 + 131626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2154111554501 is a prime.

Together with 2154111554503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154111554503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077055777250 + 1077055777251.

It is an arithmetic number, because the mean of its divisors is an integer number (1077055777251).

Almost surely, 2^{2154111554501} is an apocalyptic number.

It is an amenable number.

2154111554501 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154111554501 is an equidigital number, since it uses as much as digits as its factorization.

2154111554501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20000, while the sum is 35.

The spelling of 2154111554501 in words is "two trillion, one hundred fifty-four billion, one hundred eleven million, five hundred fifty-four thousand, five hundred one".