551616505 has 16 divisors (see below), whose sum is σ = 726118848. Its totient is φ = 398952000.

The previous prime is 551616497. The next prime is 551616551. The reversal of 551616505 is 505616155.

It is not a de Polignac number, because 551616505 - 2³ = 551616497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17751 + ... + 37660.

It is an arithmetic number, because the mean of its divisors is an integer number (45382428).

Almost surely, 2^551616505 is an apocalyptic number.

551616505 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

551616505 is a deficient number, since it is larger than the sum of its proper divisors (174502343).

551616505 is a wasteful number, since it uses less digits than its factorization.

551616505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55608.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 551616505 is about 23486.5175153746. The cubic root of 551616505 is about 820.1231745365.

The spelling of 551616505 in words is "five hundred fifty-one million, six hundred sixteen thousand, five hundred five".