1605561155 has 16 divisors (see below), whose sum is σ = 2102630400. Its totient is φ = 1167233760.

The previous prime is 1605561151. The next prime is 1605561173. The reversal of 1605561155 is 5511655061.

It is not a de Polignac number, because 1605561155 - 2² = 1605561151 is a prime.

It is a super-3 number, since 3×1605561155³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1605561151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225236 + ... + 232254.

It is an arithmetic number, because the mean of its divisors is an integer number (131414400).

Almost surely, 2^1605561155 is an apocalyptic number.

1605561155 is a deficient number, since it is larger than the sum of its proper divisors (497069245).

1605561155 is a wasteful number, since it uses less digits than its factorization.

1605561155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11194.

The product of its (nonzero) digits is 22500, while the sum is 35.

The square root of 1605561155 is about 40069.4541390321. The cubic root of 1605561155 is about 1170.9606046756.

The spelling of 1605561155 in words is "one billion, six hundred five million, five hundred sixty-one thousand, one hundred fifty-five".