161606055001650 has 192 divisors, whose sum is σ = 460115590717440. Its totient is φ = 36771066259200.

The previous prime is 161606055001613. The next prime is 161606055001663. The reversal of 161606055001650 is 56100550606161.

It is a super-2 number, since 2×161606055001650² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 724381120 + ... + 724604180.

It is an arithmetic number, because the mean of its divisors is an integer number (2396435368320).

Almost surely, 2^{161606055001650} is an apocalyptic number.

161606055001650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161606055001650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230057795358720).

161606055001650 is an abundant number, since it is smaller than the sum of its proper divisors (298509535715790).

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

161606055001650 is a wasteful number, since it uses less digits than its factorization.

161606055001650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226209 (or 226204 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 161606055001650 in words is "one hundred sixty-one trillion, six hundred six billion, fifty-five million, one thousand, six hundred fifty".