165561606510 has 32 divisors (see below), whose sum is σ = 420721260192. Its totient is φ = 41552716800.

The previous prime is 165561606499. The next prime is 165561606521. The reversal of 165561606510 is 15606165561.

165561606510 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (165561606499) and next prime (165561606521).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162314791 + ... + 162315810.

It is an arithmetic number, because the mean of its divisors is an integer number (13147539381).

Almost surely, 2^165561606510 is an apocalyptic number.

165561606510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165561606510 is an abundant number, since it is smaller than the sum of its proper divisors (255159653682).

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

165561606510 is a wasteful number, since it uses less digits than its factorization.

165561606510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324630628.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 165561606510 in words is "one hundred sixty-five billion, five hundred sixty-one million, six hundred six thousand, five hundred ten".