551006505 has 72 divisors (see below), whose sum is σ = 1110298176. Its totient is φ = 247625280.

The previous prime is 551006471. The next prime is 551006531. The reversal of 551006505 is 505600155.

551006505 is a `hidden beast` number, since 5 + 5 + 1 + 0 + 0 + 650 + 5 = 666.

It is not a de Polignac number, because 551006505 - 2¹⁹ = 550482217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1587742 + ... + 1588088.

It is an arithmetic number, because the mean of its divisors is an integer number (15420808).

Almost surely, 2^551006505 is an apocalyptic number.

It is an amenable number.

551006505 is an abundant number, since it is smaller than the sum of its proper divisors (559291671).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551006505 is a wasteful number, since it uses less digits than its factorization.

551006505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507 (or 433 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 551006505 is about 23473.5277493606. The cubic root of 551006505 is about 819.8207544956.

The spelling of 551006505 in words is "five hundred fifty-one million, six thousand, five hundred five".