551505561 has 8 divisors (see below), whose sum is σ = 735547104. Its totient is φ = 367567200.

The previous prime is 551505527. The next prime is 551505587. The reversal of 551505561 is 165505155.

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

It is not a de Polignac number, because 551505561 - 2⁶ = 551505497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551505161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12316 + ... + 35421.

It is an arithmetic number, because the mean of its divisors is an integer number (91943388).

Almost surely, 2^551505561 is an apocalyptic number.

It is an amenable number.

551505561 is a deficient number, since it is larger than the sum of its proper divisors (184041543).

551505561 is a wasteful number, since it uses less digits than its factorization.

551505561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51591.

The product of its (nonzero) digits is 18750, while the sum is 33.

The square root of 551505561 is about 23484.1555309106. The cubic root of 551505561 is about 820.0681883609.

The spelling of 551505561 in words is "five hundred fifty-one million, five hundred five thousand, five hundred sixty-one".