55563191890 has 8 divisors (see below), whose sum is σ = 100013745420. Its totient is φ = 22225276752.

The previous prime is 55563191863. The next prime is 55563191909. The reversal of 55563191890 is 9819136555.

It can be written as a sum of positive squares in 2 ways, for example, as 45153275049 + 10409916841 = 212493^2 + 102029^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 2778159585 + ... + 2778159604.

Almost surely, 2^55563191890 is an apocalyptic number.

55563191890 is a deficient number, since it is larger than the sum of its proper divisors (44450553530).

55563191890 is a wasteful number, since it uses less digits than its factorization.

55563191890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5556319196.

The product of its (nonzero) digits is 1458000, while the sum is 52.

The spelling of 55563191890 in words is "fifty-five billion, five hundred sixty-three million, one hundred ninety-one thousand, eight hundred ninety".