165561005610 has 192 divisors, whose sum is σ = 577958734080. Its totient is φ = 31755939840.

The previous prime is 165561005591. The next prime is 165561005653. The reversal of 165561005610 is 16500165561.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 828775 + ... + 1008954.

It is an arithmetic number, because the mean of its divisors is an integer number (3010201740).

Almost surely, 2^165561005610 is an apocalyptic number.

165561005610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165561005610 is an abundant number, since it is smaller than the sum of its proper divisors (412397728470).

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

165561005610 is a wasteful number, since it uses less digits than its factorization.

165561005610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837773 (or 1837770 counting only the distinct ones).

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

The spelling of 165561005610 in words is "one hundred sixty-five billion, five hundred sixty-one million, five thousand, six hundred ten".