1165720170 has 32 divisors (see below), whose sum is σ = 2803883328. Its totient is φ = 310174848.

The previous prime is 1165720169. The next prime is 1165720181. The reversal of 1165720170 is 710275611.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28804 + ... + 56223.

It is an arithmetic number, because the mean of its divisors is an integer number (87621354).

Almost surely, 2^1165720170 is an apocalyptic number.

1165720170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1165720170 is an abundant number, since it is smaller than the sum of its proper divisors (1638163158).

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

1165720170 is a wasteful number, since it uses less digits than its factorization.

1165720170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85494.

The product of its (nonzero) digits is 2940, while the sum is 30.

The square root of 1165720170 is about 34142.6444494272. The cubic root of 1165720170 is about 1052.4418362398.

Adding to 1165720170 its reverse (710275611), we get a palindrome (1875995781).

The spelling of 1165720170 in words is "one billion, one hundred sixty-five million, seven hundred twenty thousand, one hundred seventy".