169899666768 has 180 divisors, whose sum is σ = 515389576572. Its totient is φ = 52224307200.

The previous prime is 169899666749. The next prime is 169899666787. The reversal of 169899666768 is 867666998961.

It is an interprime number because it is at equal distance from previous prime (169899666749) and next prime (169899666787).

It can be written as a sum of positive squares in 6 ways, for example, as 64347454224 + 105552212544 = 253668^2 + 324888^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 29224630 + ... + 29230442.

Almost surely, 2^169899666768 is an apocalyptic number.

169899666768 is a gapful number since it is divisible by the number (18) 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 169899666768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257694788286).

169899666768 is an abundant number, since it is smaller than the sum of its proper divisors (345489909804).

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

169899666768 is a wasteful number, since it uses less digits than its factorization.

169899666768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7054 (or 7032 counting only the distinct ones).

The product of its digits is 2539579392, while the sum is 81.

The spelling of 169899666768 in words is "one hundred sixty-nine billion, eight hundred ninety-nine million, six hundred sixty-six thousand, seven hundred sixty-eight".