855618077 has 2 divisors, whose sum is σ = 855618078. Its totient is φ = 855618076.

The previous prime is 855618017. The next prime is 855618079. The reversal of 855618077 is 770816558.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 852990436 + 2627641 = 29206^2 + 1621^2 .

It is a cyclic number.

It is not a de Polignac number, because 855618077 - 2¹⁴ = 855601693 is a prime.

Together with 855618079, 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 (855618079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427809038 + 427809039.

It is an arithmetic number, because the mean of its divisors is an integer number (427809039).

Almost surely, 2^855618077 is an apocalyptic number.

It is an amenable number.

855618077 is a deficient number, since it is larger than the sum of its proper divisors (1).

855618077 is an equidigital number, since it uses as much as digits as its factorization.

855618077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 470400, while the sum is 47.

The square root of 855618077 is about 29250.9500187601. The cubic root of 855618077 is about 949.3506465533.

The spelling of 855618077 in words is "eight hundred fifty-five million, six hundred eighteen thousand, seventy-seven".