1665161106510 has 128 divisors (see below), whose sum is σ = 4534204262400. Its totient is φ = 387793336320.

The previous prime is 1665161106487. The next prime is 1665161106551. The reversal of 1665161106510 is 156011615661.

It is a Curzon number.

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 63 ways as a sum of consecutive naturals, for example, 101446 + ... + 1827734.

It is an arithmetic number, because the mean of its divisors is an integer number (35423470800).

Almost surely, 2^{1665161106510} is an apocalyptic number.

1665161106510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665161106510, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2267102131200).

1665161106510 is an abundant number, since it is smaller than the sum of its proper divisors (2869043155890).

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

1665161106510 is a wasteful number, since it uses less digits than its factorization.

1665161106510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1726426.

The product of its (nonzero) digits is 32400, while the sum is 39.

The spelling of 1665161106510 in words is "one trillion, six hundred sixty-five billion, one hundred sixty-one million, one hundred six thousand, five hundred ten".