171212009472 has 260 divisors, whose sum is σ = 584533481136. Its totient is φ = 48917053440.

The previous prime is 171212009431. The next prime is 171212009497. The reversal of 171212009472 is 274900212171.

171212009472 is a `hidden beast` number, since 171 + 2 + 12 + 0 + 0 + 9 + 472 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2285572 + ... + 2359292.

Almost surely, 2^171212009472 is an apocalyptic number.

171212009472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 171212009472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292266740568).

171212009472 is an abundant number, since it is smaller than the sum of its proper divisors (413321471664).

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

171212009472 is an frugal number, since it uses more digits than its factorization.

171212009472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73764 (or 73733 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The spelling of 171212009472 in words is "one hundred seventy-one billion, two hundred twelve million, nine thousand, four hundred seventy-two".