2181607287887 has 2 divisors, whose sum is σ = 2181607287888. Its totient is φ = 2181607287886.

The previous prime is 2181607287851. The next prime is 2181607287889. The reversal of 2181607287887 is 7887827061812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2181607287887 - 2²² = 2181603093583 is a prime.

Together with 2181607287889, 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 (2181607287889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090803643943 + 1090803643944.

It is an arithmetic number, because the mean of its divisors is an integer number (1090803643944).

Almost surely, 2^{2181607287887} is an apocalyptic number.

2181607287887 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181607287887 is an equidigital number, since it uses as much as digits as its factorization.

2181607287887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33718272, while the sum is 65.

The spelling of 2181607287887 in words is "two trillion, one hundred eighty-one billion, six hundred seven million, two hundred eighty-seven thousand, eight hundred eighty-seven".