551565511 has 6 divisors (see below), whose sum is σ = 641617080. Its totient is φ = 472770396.

The previous prime is 551565503. The next prime is 551565517. The reversal of 551565511 is 115565155.

It is not a de Polignac number, because 551565511 - 2³ = 551565503 is a prime.

It is a super-2 number, since 2×551565511² = 608449025849382242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551565517) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5628171 + ... + 5628268.

It is an arithmetic number, because the mean of its divisors is an integer number (106936180).

Almost surely, 2^551565511 is an apocalyptic number.

551565511 is a deficient number, since it is larger than the sum of its proper divisors (90051569).

551565511 is a wasteful number, since it uses less digits than its factorization.

551565511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11256453 (or 11256446 counting only the distinct ones).

The product of its digits is 18750, while the sum is 34.

The square root of 551565511 is about 23485.4318887263. The cubic root of 551565511 is about 820.0979017552.

The spelling of 551565511 in words is "five hundred fifty-one million, five hundred sixty-five thousand, five hundred eleven".