1827613661666 has 16 divisors (see below), whose sum is σ = 2952544036344. Its totient is φ = 843443985024.

The previous prime is 1827613661597. The next prime is 1827613661689. The reversal of 1827613661666 is 6661663167281.

It can be written as a sum of positive squares in 4 ways, for example, as 366587866225 + 1461025795441 = 605465^2 + 1208729^2 .

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 7 ways as a sum of consecutive naturals, for example, 2597261 + ... + 3225056.

Almost surely, 2^{1827613661666} is an apocalyptic number.

1827613661666 is a deficient number, since it is larger than the sum of its proper divisors (1124930374678).

1827613661666 is a wasteful number, since it uses less digits than its factorization.

1827613661666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5834405.

The product of its digits is 15676416, while the sum is 59.

The spelling of 1827613661666 in words is "one trillion, eight hundred twenty-seven billion, six hundred thirteen million, six hundred sixty-one thousand, six hundred sixty-six".