551559965 has 16 divisors (see below), whose sum is σ = 726834816. Its totient is φ = 398472000.

The previous prime is 551559929. The next prime is 551559973. The reversal of 551559965 is 569955155.

It is not a de Polignac number, because 551559965 - 2⁸ = 551559709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24902 + ... + 41511.

It is an arithmetic number, because the mean of its divisors is an integer number (45427176).

Almost surely, 2^551559965 is an apocalyptic number.

551559965 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

551559965 is a deficient number, since it is larger than the sum of its proper divisors (175274851).

551559965 is a wasteful number, since it uses less digits than its factorization.

551559965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66580.

The product of its digits is 1518750, while the sum is 50.

The square root of 551559965 is about 23485.3138152336. The cubic root of 551559965 is about 820.0951530468.

The spelling of 551559965 in words is "five hundred fifty-one million, five hundred fifty-nine thousand, nine hundred sixty-five".