5561366551 has 8 divisors (see below), whose sum is σ = 6182363264. Its totient is φ = 4967969760.

The previous prime is 5561366543. The next prime is 5561366561. The reversal of 5561366551 is 1556631655.

It is a happy number.

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

It is not a de Polignac number, because 5561366551 - 2³ = 5561366543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5561366498 and 5561366507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5561366521) by changing a digit.

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, 6899556 + ... + 6900361.

It is an arithmetic number, because the mean of its divisors is an integer number (772795408).

Almost surely, 2^5561366551 is an apocalyptic number.

5561366551 is a deficient number, since it is larger than the sum of its proper divisors (620996713).

5561366551 is a wasteful number, since it uses less digits than its factorization.

5561366551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13799961.

The product of its digits is 405000, while the sum is 43.

The square root of 5561366551 is about 74574.5704043946. The cubic root of 5561366551 is about 1771.7149105388.

The spelling of 5561366551 in words is "five billion, five hundred sixty-one million, three hundred sixty-six thousand, five hundred fifty-one".