165661260 has 48 divisors (see below), whose sum is σ = 491139936. Its totient is φ = 41577472.

The previous prime is 165661259. The next prime is 165661267. The reversal of 165661260 is 62166561.

It is not an unprimeable number, because it can be changed into a prime (165661267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80187 + ... + 82226.

It is an arithmetic number, because the mean of its divisors is an integer number (10232082).

Almost surely, 2^165661260 is an apocalyptic number.

165661260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165661260 is an abundant number, since it is smaller than the sum of its proper divisors (325478676).

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

165661260 is a wasteful number, since it uses less digits than its factorization.

165661260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162442 (or 162440 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 165661260 is about 12870.9463521530. The cubic root of 165661260 is about 549.2123822863.

The spelling of 165661260 in words is "one hundred sixty-five million, six hundred sixty-one thousand, two hundred sixty".