165861760 has 32 divisors (see below), whose sum is σ = 396514800. Its totient is φ = 66344448.

The previous prime is 165861737. The next prime is 165861779. The reversal of 165861760 is 67168561.

165861760 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128940 + ... + 130219.

Almost surely, 2^165861760 is an apocalyptic number.

165861760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165861760 is an abundant number, since it is smaller than the sum of its proper divisors (230653040).

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

165861760 is an equidigital number, since it uses as much as digits as its factorization.

165861760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259178 (or 259166 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 165861760 is about 12878.7328569235. The cubic root of 165861760 is about 549.4338637350.

The spelling of 165861760 in words is "one hundred sixty-five million, eight hundred sixty-one thousand, seven hundred sixty".