84678885261 has 24 divisors (see below), whose sum is σ = 124591254840. Its totient is φ = 55410786816.

The previous prime is 84678885209. The next prime is 84678885281. The reversal of 84678885261 is 16258887648.

It can be written as a sum of positive squares in 4 ways, for example, as 654848100 + 84024037161 = 25590^2 + 289869^2 .

It is not a de Polignac number, because 84678885261 - 2⁹ = 84678884749 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84678885281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 276090 + ... + 495563.

It is an arithmetic number, because the mean of its divisors is an integer number (5191302285).

Almost surely, 2^84678885261 is an apocalyptic number.

It is an amenable number.

84678885261 is a deficient number, since it is larger than the sum of its proper divisors (39912369579).

84678885261 is a wasteful number, since it uses less digits than its factorization.

84678885261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771885 (or 771882 counting only the distinct ones).

The product of its digits is 41287680, while the sum is 63.

The spelling of 84678885261 in words is "eighty-four billion, six hundred seventy-eight million, eight hundred eighty-five thousand, two hundred sixty-one".