855284009661 has 32 divisors (see below), whose sum is σ = 1274536368000. Its totient is φ = 566839171584.

The previous prime is 855284009639. The next prime is 855284009731. The reversal of 855284009661 is 166900482558.

855284009661 is a `hidden beast` number, since 8 + 552 + 84 + 0 + 0 + 9 + 6 + 6 + 1 = 666.

It is not a de Polignac number, because 855284009661 - 2²¹ = 855281912509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 855284009598 and 855284009607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855284009621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17901741 + ... + 17949453.

It is an arithmetic number, because the mean of its divisors is an integer number (39829261500).

Almost surely, 2^855284009661 is an apocalyptic number.

It is an amenable number.

855284009661 is a deficient number, since it is larger than the sum of its proper divisors (419252358339).

855284009661 is a wasteful number, since it uses less digits than its factorization.

855284009661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51610 (or 51604 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 54.

The spelling of 855284009661 in words is "eight hundred fifty-five billion, two hundred eighty-four million, nine thousand, six hundred sixty-one".