551545816 has 16 divisors (see below), whose sum is σ = 1045769400. Its totient is φ = 272673984.

The previous prime is 551545811. The next prime is 551545823. The reversal of 551545816 is 618545155.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551545811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386610 + ... + 388033.

Almost surely, 2^551545816 is an apocalyptic number.

It is an amenable number.

551545816 is a deficient number, since it is larger than the sum of its proper divisors (494223584).

551545816 is a wasteful number, since it uses less digits than its factorization.

551545816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774738 (or 774734 counting only the distinct ones).

The product of its digits is 120000, while the sum is 40.

The square root of 551545816 is about 23485.0125824961. The cubic root of 551545816 is about 820.0881404364.

The spelling of 551545816 in words is "five hundred fifty-one million, five hundred forty-five thousand, eight hundred sixteen".