551605505 has 32 divisors (see below), whose sum is σ = 743592960. Its totient is φ = 389350080.

The previous prime is 551605487. The next prime is 551605507. The reversal of 551605505 is 505506155.

551605505 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 551605505 - 2¹⁶ = 551539969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551605507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 422684 + ... + 423986.

It is an arithmetic number, because the mean of its divisors is an integer number (23237280).

Almost surely, 2^551605505 is an apocalyptic number.

551605505 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

551605505 is a deficient number, since it is larger than the sum of its proper divisors (191987455).

551605505 is a wasteful number, since it uses less digits than its factorization.

551605505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541.

The product of its (nonzero) digits is 18750, while the sum is 32.

The square root of 551605505 is about 23486.2833373014. The cubic root of 551605505 is about 820.1177230349.

The spelling of 551605505 in words is "five hundred fifty-one million, six hundred five thousand, five hundred five".