855620811 has 6 divisors (see below), whose sum is σ = 1235896740. Its totient is φ = 570413868.

The previous prime is 855620803. The next prime is 855620827. The reversal of 855620811 is 118026558.

855620811 is a `hidden beast` number, since 8 + 556 + 20 + 81 + 1 = 666.

It is not a de Polignac number, because 855620811 - 2³ = 855620803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855620011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47534481 + ... + 47534498.

It is an arithmetic number, because the mean of its divisors is an integer number (205982790).

Almost surely, 2^855620811 is an apocalyptic number.

855620811 is a deficient number, since it is larger than the sum of its proper divisors (380275929).

855620811 is a wasteful number, since it uses less digits than its factorization.

855620811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95068985 (or 95068982 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The square root of 855620811 is about 29250.9967522476. The cubic root of 855620811 is about 949.3516577217.

The spelling of 855620811 in words is "eight hundred fifty-five million, six hundred twenty thousand, eight hundred eleven".