161605511166042 has 20 divisors (see below), whose sum is σ = 362116052798346. Its totient is φ = 53868503721960.

The previous prime is 161605511165983. The next prime is 161605511166049. The reversal of 161605511166042 is 240661115506161.

It is a happy number.

161605511166042 is a `hidden beast` number, since 1 + 6 + 1 + 60 + 5 + 511 + 16 + 60 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 144397209538521 + 17208301627521 = 12016539^2 + 4148289^2 .

It is a super-2 number, since 2×161605511166042² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161605511166049) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 498782441709 + ... + 498782442032.

Almost surely, 2^{161605511166042} is an apocalyptic number.

161605511166042 is an abundant number, since it is smaller than the sum of its proper divisors (200510541632304).

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

161605511166042 is an equidigital number, since it uses as much as digits as its factorization.

161605511166042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997564883755 (or 997564883746 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The spelling of 161605511166042 in words is "one hundred sixty-one trillion, six hundred five billion, five hundred eleven million, one hundred sixty-six thousand, forty-two".