855645820983 has 12 divisors (see below), whose sum is σ = 1254379612408. Its totient is φ = 561916658160.

The previous prime is 855645820933. The next prime is 855645820987. The reversal of 855645820983 is 389028546558.

855645820983 is a `hidden beast` number, since 8 + 556 + 4 + 58 + 20 + 9 + 8 + 3 = 666.

It is not a de Polignac number, because 855645820983 - 2³⁰ = 854572079159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 855645820983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855645820987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 709490128 + ... + 709491333.

Almost surely, 2^855645820983 is an apocalyptic number.

855645820983 is a deficient number, since it is larger than the sum of its proper divisors (398733791425).

855645820983 is a wasteful number, since it uses less digits than its factorization.

855645820983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418981534 (or 1418981531 counting only the distinct ones).

The product of its (nonzero) digits is 82944000, while the sum is 63.

The spelling of 855645820983 in words is "eight hundred fifty-five billion, six hundred forty-five million, eight hundred twenty thousand, nine hundred eighty-three".