855391834477 has 2 divisors, whose sum is σ = 855391834478. Its totient is φ = 855391834476.

The previous prime is 855391834463. The next prime is 855391834487. The reversal of 855391834477 is 774438193558.

855391834477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 849136448196 + 6255386281 = 921486^2 + 79091^2 .

It is a cyclic number.

It is not a de Polignac number, because 855391834477 - 2¹¹ = 855391832429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855391834447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427695917238 + 427695917239.

It is an arithmetic number, because the mean of its divisors is an integer number (427695917239).

Almost surely, 2^855391834477 is an apocalyptic number.

It is an amenable number.

855391834477 is a deficient number, since it is larger than the sum of its proper divisors (1).

855391834477 is an equidigital number, since it uses as much as digits as its factorization.

855391834477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 101606400, while the sum is 64.

The spelling of 855391834477 in words is "eight hundred fifty-five billion, three hundred ninety-one million, eight hundred thirty-four thousand, four hundred seventy-seven".