169799509440 has 560 divisors, whose sum is σ = 672989036544. Its totient is φ = 40284518400.

The previous prime is 169799509417. The next prime is 169799509457. The reversal of 169799509440 is 44905997961.

169799509440 is a `hidden beast` number, since 16 + 9 + 79 + 9 + 509 + 4 + 40 = 666.

It is a super-2 number, since 2×169799509440² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 13394305 + ... + 13406975.

Almost surely, 2^169799509440 is an apocalyptic number.

169799509440 is a gapful number since it is divisible by the number (10) 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 169799509440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336494518272).

169799509440 is an abundant number, since it is smaller than the sum of its proper divisors (503189527104).

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

169799509440 is a wasteful number, since it uses less digits than its factorization.

169799509440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12758 (or 12739 counting only the distinct ones).

The product of its (nonzero) digits is 22044960, while the sum is 63.

The spelling of 169799509440 in words is "one hundred sixty-nine billion, seven hundred ninety-nine million, five hundred nine thousand, four hundred forty".