551985387912 has 64 divisors (see below), whose sum is σ = 1752334569600. Its totient is φ = 157710110400.

The previous prime is 551985387907. The next prime is 551985387913. The reversal of 551985387912 is 219783589155.

551985387912 is a `hidden beast` number, since 5 + 5 + 1 + 9 + 8 + 538 + 7 + 91 + 2 = 666.

It is a super-2 number, since 2×551985387912² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 551985387912.

It is not an unprimeable number, because it can be changed into a prime (551985387913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182533339 + ... + 182536362.

It is an arithmetic number, because the mean of its divisors is an integer number (27380227650).

Almost surely, 2^551985387912 is an apocalyptic number.

It is an amenable number.

551985387912 is an abundant number, since it is smaller than the sum of its proper divisors (1200349181688).

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

551985387912 is a wasteful number, since it uses less digits than its factorization.

551985387912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365069723 (or 365069713 counting only the distinct ones).

The product of its digits is 27216000, while the sum is 63.

The spelling of 551985387912 in words is "five hundred fifty-one billion, nine hundred eighty-five million, three hundred eighty-seven thousand, nine hundred twelve".