987666205 has 4 divisors (see below), whose sum is σ = 1185199452. Its totient is φ = 790132960.

The previous prime is 987666193. The next prime is 987666241. The reversal of 987666205 is 502666789.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 502666789 = 271 ⋅1854859.

It can be written as a sum of positive squares in 2 ways, for example, as 131928196 + 855738009 = 11486^2 + 29253^2 .

It is a de Polignac number, because none of the positive numbers 2^k-987666205 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98766616 + ... + 98766625.

It is an arithmetic number, because the mean of its divisors is an integer number (296299863).

Almost surely, 2^987666205 is an apocalyptic number.

It is an amenable number.

987666205 is a deficient number, since it is larger than the sum of its proper divisors (197533247).

987666205 is a wasteful number, since it uses less digits than its factorization.

987666205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197533246.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 987666205 is about 31427.1571256453. The cubic root of 987666205 is about 995.8717157213.

The spelling of 987666205 in words is "nine hundred eighty-seven million, six hundred sixty-six thousand, two hundred five".