855721773 has 16 divisors (see below), whose sum is σ = 1271341440. Its totient is φ = 568858752.

The previous prime is 855721733. The next prime is 855721813. The reversal of 855721773 is 377127558.

855721773 is a `hidden beast` number, since 8 + 5 + 572 + 1 + 7 + 73 = 666.

It is an interprime number because it is at equal distance from previous prime (855721733) and next prime (855721813).

It is not a de Polignac number, because 855721773 - 2²⁸ = 587286317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855721733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35361 + ... + 54422.

It is an arithmetic number, because the mean of its divisors is an integer number (79458840).

Almost surely, 2^855721773 is an apocalyptic number.

It is an amenable number.

855721773 is a deficient number, since it is larger than the sum of its proper divisors (415619667).

855721773 is a wasteful number, since it uses less digits than its factorization.

855721773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90145 (or 90139 counting only the distinct ones).

The product of its digits is 411600, while the sum is 45.

The square root of 855721773 is about 29252.7224886847. The cubic root of 855721773 is about 949.3889969539.

The spelling of 855721773 in words is "eight hundred fifty-five million, seven hundred twenty-one thousand, seven hundred seventy-three".