5551661550 has 24 divisors (see below), whose sum is σ = 13768121016. Its totient is φ = 1480443040.

The previous prime is 5551661519. The next prime is 5551661561. The reversal of 5551661550 is 551661555.

It is a junction number, because it is equal to n+sod(n) for n = 5551661499 and 5551661508.

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 11 ways as a sum of consecutive naturals, for example, 18505389 + ... + 18505688.

It is an arithmetic number, because the mean of its divisors is an integer number (573671709).

Almost surely, 2^5551661550 is an apocalyptic number.

5551661550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

5551661550 is an abundant number, since it is smaller than the sum of its proper divisors (8216459466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5551661550 is a wasteful number, since it uses less digits than its factorization.

5551661550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37011092 (or 37011087 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 39.

The square root of 5551661550 is about 74509.4728876805. The cubic root of 5551661550 is about 1770.6837187491.

The spelling of 5551661550 in words is "five billion, five hundred fifty-one million, six hundred sixty-one thousand, five hundred fifty".