55555505581212 has 108 divisors (see below), whose sum is σ = 175925767746456. Its totient is φ = 14652001465920.

The previous prime is 55555505581211. The next prime is 55555505581217. The reversal of 55555505581212 is 21218550555555.

55555505581212 is a `hidden beast` number, since 5 + 5 + 5 + 5 + 5 + 50 + 5 + 581 + 2 + 1 + 2 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55555505581211) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1211286714 + ... + 1211332577.

Almost surely, 2^{55555505581212} is an apocalyptic number.

55555505581212 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

55555505581212 is an abundant number, since it is smaller than the sum of its proper divisors (120370262165244).

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

55555505581212 is a wasteful number, since it uses less digits than its factorization.

55555505581212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422619328 (or 2422619316 counting only the distinct ones).

The product of its (nonzero) digits is 12500000, while the sum is 54.

The spelling of 55555505581212 in words is "fifty-five trillion, five hundred fifty-five billion, five hundred five million, five hundred eighty-one thousand, two hundred twelve".