55131583666 has 16 divisors (see below), whose sum is σ = 83767449600. Its totient is φ = 27211282560.

The previous prime is 55131583657. The next prime is 55131583691. The reversal of 55131583666 is 66638513155.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 494815 + ... + 595906.

It is an arithmetic number, because the mean of its divisors is an integer number (5235465600).

Almost surely, 2^55131583666 is an apocalyptic number.

55131583666 is a deficient number, since it is larger than the sum of its proper divisors (28635865934).

55131583666 is a wasteful number, since it uses less digits than its factorization.

55131583666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091049.

The product of its digits is 1944000, while the sum is 49.

The spelling of 55131583666 in words is "fifty-five billion, one hundred thirty-one million, five hundred eighty-three thousand, six hundred sixty-six".