4002161785 has 4 divisors (see below), whose sum is σ = 4802594148. Its totient is φ = 3201729424.

The previous prime is 4002161731. The next prime is 4002161803. The reversal of 4002161785 is 5871612004.

4002161785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3155293584 + 846868201 = 56172^2 + 29101^2 .

It is a cyclic number.

It is not a de Polignac number, because 4002161785 - 2¹⁵ = 4002129017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4002161785.

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, 400216174 + ... + 400216183.

It is an arithmetic number, because the mean of its divisors is an integer number (1200648537).

Almost surely, 2^4002161785 is an apocalyptic number.

It is an amenable number.

4002161785 is a deficient number, since it is larger than the sum of its proper divisors (800432363).

4002161785 is an equidigital number, since it uses as much as digits as its factorization.

4002161785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800432362.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 4002161785 is about 63262.6413059082. The cubic root of 4002161785 is about 1587.6869687821.

Adding to 4002161785 its reverse (5871612004), we get a palindrome (9873773789).

The spelling of 4002161785 in words is "four billion, two million, one hundred sixty-one thousand, seven hundred eighty-five".