164436891550 has 12 divisors (see below), whose sum is σ = 305852618376. Its totient is φ = 65774756600.

The previous prime is 164436891539. The next prime is 164436891569. The reversal of 164436891550 is 55198634461.

It is a happy number.

It is a super-3 number, since 3×164436891550³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1644368866 + ... + 1644368965.

It is an arithmetic number, because the mean of its divisors is an integer number (25487718198).

Almost surely, 2^164436891550 is an apocalyptic number.

164436891550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

164436891550 is a deficient number, since it is larger than the sum of its proper divisors (141415726826).

164436891550 is a wasteful number, since it uses less digits than its factorization.

164436891550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3288737843 (or 3288737838 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 52.

The spelling of 164436891550 in words is "one hundred sixty-four billion, four hundred thirty-six million, eight hundred ninety-one thousand, five hundred fifty".