1165161573 has 24 divisors (see below), whose sum is σ = 1700733528. Its totient is φ = 768632832.

The previous prime is 1165161551. The next prime is 1165161587. The reversal of 1165161573 is 3751615611.

1165161573 is a `hidden beast` number, since 11 + 65 + 16 + 1 + 573 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4941729 + 1160219844 = 2223^2 + 34062^2 .

It is not a de Polignac number, because 1165161573 - 2¹⁸ = 1164899429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165161973) 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, 433911 + ... + 436587.

It is an arithmetic number, because the mean of its divisors is an integer number (70863897).

Almost surely, 2^1165161573 is an apocalyptic number.

It is an amenable number.

1165161573 is a deficient number, since it is larger than the sum of its proper divisors (535571955).

1165161573 is a wasteful number, since it uses less digits than its factorization.

1165161573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3173 (or 3170 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 1165161573 is about 34134.4631274611. The cubic root of 1165161573 is about 1052.2737041856.

The spelling of 1165161573 in words is "one billion, one hundred sixty-five million, one hundred sixty-one thousand, five hundred seventy-three".