1565605161 has 24 divisors (see below), whose sum is σ = 2324724480. Its totient is φ = 1014577056.

The previous prime is 1565605051. The next prime is 1565605177. The reversal of 1565605161 is 1615065651.

It is not a de Polignac number, because 1565605161 - 2⁷ = 1565605033 is a prime.

It is a super-2 number, since 2×1565605161² = 4902239040299671842, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1565605661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 605770 + ... + 608348.

It is an arithmetic number, because the mean of its divisors is an integer number (96863520).

Almost surely, 2^1565605161 is an apocalyptic number.

It is an amenable number.

1565605161 is a deficient number, since it is larger than the sum of its proper divisors (759119319).

1565605161 is a wasteful number, since it uses less digits than its factorization.

1565605161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4445 (or 4442 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1565605161 is about 39567.7287824308. The cubic root of 1565605161 is about 1161.1653867266.

The spelling of 1565605161 in words is "one billion, five hundred sixty-five million, six hundred five thousand, one hundred sixty-one".