55565661650 has 24 divisors (see below), whose sum is σ = 103360008420. Its totient is φ = 22224570560.

The previous prime is 55565661637. The next prime is 55565661667. The reversal of 55565661650 is 5616656555.

It can be written as a sum of positive squares in 6 ways, for example, as 42457014601 + 13108647049 = 206051^2 + 114493^2 .

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 777212 + ... + 845688.

Almost surely, 2^55565661650 is an apocalyptic number.

55565661650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55565661650 is a deficient number, since it is larger than the sum of its proper divisors (47794346770).

55565661650 is a wasteful number, since it uses less digits than its factorization.

55565661650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84718 (or 84713 counting only the distinct ones).

The product of its (nonzero) digits is 4050000, while the sum is 50.

The spelling of 55565661650 in words is "fifty-five billion, five hundred sixty-five million, six hundred sixty-one thousand, six hundred fifty".