505654172158188 has 24 divisors (see below), whose sum is σ = 1207298333526208. Its totient is φ = 164631590935056.

The previous prime is 505654172158147. The next prime is 505654172158189. The reversal of 505654172158188 is 881851271456505.

It is a super-2 number, since 2×505654172158188² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (505654172158189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 489974972506 + ... + 489974973537.

Almost surely, 2^{505654172158188} is an apocalyptic number.

It is an amenable number.

505654172158188 is an abundant number, since it is smaller than the sum of its proper divisors (701644161368020).

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

505654172158188 is a wasteful number, since it uses less digits than its factorization.

505654172158188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979949946093 (or 979949946091 counting only the distinct ones).

The product of its (nonzero) digits is 107520000, while the sum is 66.

The spelling of 505654172158188 in words is "five hundred five trillion, six hundred fifty-four billion, one hundred seventy-two million, one hundred fifty-eight thousand, one hundred eighty-eight".