551878785 has 16 divisors (see below), whose sum is σ = 981118080. Its totient is φ = 294335280.

The previous prime is 551878777. The next prime is 551878793. The reversal of 551878785 is 587878155.

551878785 is a `hidden beast` number, since 551 + 8 + 7 + 8 + 7 + 85 = 666.

It is an interprime number because it is at equal distance from previous prime (551878777) and next prime (551878793).

It is not a de Polignac number, because 551878785 - 2³ = 551878777 is a prime.

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, 2043861 + ... + 2044130.

It is an arithmetic number, because the mean of its divisors is an integer number (61319880).

Almost surely, 2^551878785 is an apocalyptic number.

It is an amenable number.

551878785 is a deficient number, since it is larger than the sum of its proper divisors (429239295).

551878785 is a wasteful number, since it uses less digits than its factorization.

551878785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4088005 (or 4087999 counting only the distinct ones).

The product of its digits is 3136000, while the sum is 54.

The square root of 551878785 is about 23492.1004807999. The cubic root of 551878785 is about 820.2531367001.

The spelling of 551878785 in words is "five hundred fifty-one million, eight hundred seventy-eight thousand, seven hundred eighty-five".