161555105111085 has 96 divisors (see below), whose sum is σ = 320200912711680. Its totient is φ = 73815017472000.

The previous prime is 161555105111083. The next prime is 161555105111119. The reversal of 161555105111085 is 580111501555161.

161555105111085 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 5 + 51 + 0 + 511 + 1 + 0 + 85 = 666.

It is not a de Polignac number, because 161555105111085 - 2¹ = 161555105111083 is a prime.

It is a super-2 number, since 2×161555105111085² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 161555105111085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161555105111083) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5336944500 + ... + 5336974770.

It is an arithmetic number, because the mean of its divisors is an integer number (3335426174080).

Almost surely, 2^{161555105111085} is an apocalyptic number.

161555105111085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161555105111085 is a deficient number, since it is larger than the sum of its proper divisors (158645807600595).

161555105111085 is a wasteful number, since it uses less digits than its factorization.

161555105111085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38619 (or 38616 counting only the distinct ones).

The product of its (nonzero) digits is 150000, while the sum is 45.

The spelling of 161555105111085 in words is "one hundred sixty-one trillion, five hundred fifty-five billion, one hundred five million, one hundred eleven thousand, eighty-five".