1605161061 has 72 divisors (see below), whose sum is σ = 2820115584. Its totient is φ = 876355200.

The previous prime is 1605161039. The next prime is 1605161087. The reversal of 1605161061 is 1601615061.

It is not a de Polignac number, because 1605161061 - 2¹⁸ = 1604898917 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605161561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 890361 + ... + 892161.

It is an arithmetic number, because the mean of its divisors is an integer number (39168272).

Almost surely, 2^1605161061 is an apocalyptic number.

It is an amenable number.

1605161061 is a deficient number, since it is larger than the sum of its proper divisors (1214954523).

1605161061 is a wasteful number, since it uses less digits than its factorization.

1605161061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911 (or 1901 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1605161061 is about 40064.4613217250. The cubic root of 1605161061 is about 1170.8633316793.

The spelling of 1605161061 in words is "one billion, six hundred five million, one hundred sixty-one thousand, sixty-one".