855188665652549 has 2 divisors, whose sum is σ = 855188665652550. Its totient is φ = 855188665652548.

The previous prime is 855188665652539. The next prime is 855188665652567. The reversal of 855188665652549 is 945256566881558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 838202669992900 + 16985995659649 = 28951730^2 + 4121407^2 .

It is a cyclic number.

It is not a de Polignac number, because 855188665652549 - 2¹⁶ = 855188665587013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855188665652539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427594332826274 + 427594332826275.

It is an arithmetic number, because the mean of its divisors is an integer number (427594332826275).

Almost surely, 2^{855188665652549} is an apocalyptic number.

It is an amenable number.

855188665652549 is a deficient number, since it is larger than the sum of its proper divisors (1).

855188665652549 is an equidigital number, since it uses as much as digits as its factorization.

855188665652549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24883200000, while the sum is 83.

The spelling of 855188665652549 in words is "eight hundred fifty-five trillion, one hundred eighty-eight billion, six hundred sixty-five million, six hundred fifty-two thousand, five hundred forty-nine".