4032135661 has 4 divisors (see below), whose sum is σ = 4042292572. Its totient is φ = 4021978752.

The previous prime is 4032135631. The next prime is 4032135743. The reversal of 4032135661 is 1665312304.

4032135661 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 3025660036 + 1006475625 = 55006^2 + 31725^2 .

It is a cyclic number.

It is not a de Polignac number, because 4032135661 - 2⁷ = 4032135533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4032135631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5077860 + ... + 5078653.

It is an arithmetic number, because the mean of its divisors is an integer number (1010573143).

Almost surely, 2^4032135661 is an apocalyptic number.

It is an amenable number.

4032135661 is a deficient number, since it is larger than the sum of its proper divisors (10156911).

4032135661 is a wasteful number, since it uses less digits than its factorization.

4032135661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10156910.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 4032135661 is about 63499.0996865310. The cubic root of 4032135661 is about 1591.6407335827.

Adding to 4032135661 its reverse (1665312304), we get a palindrome (5697447965).

The spelling of 4032135661 in words is "four billion, thirty-two million, one hundred thirty-five thousand, six hundred sixty-one".