4003601645 has 16 divisors (see below), whose sum is σ = 4999389120. Its totient is φ = 3075362304.

The previous prime is 4003601633. The next prime is 4003601681. The reversal of 4003601645 is 5461063004.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 4003601645 - 2⁸ = 4003601389 is a prime.

It is a super-3 number, since 3×4003601645³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145124 + ... + 170493.

It is an arithmetic number, because the mean of its divisors is an integer number (312461820).

Almost surely, 2^4003601645 is an apocalyptic number.

It is an amenable number.

4003601645 is a deficient number, since it is larger than the sum of its proper divisors (995787475).

4003601645 is a wasteful number, since it uses less digits than its factorization.

4003601645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315724.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 4003601645 is about 63274.0203005941. The cubic root of 4003601645 is about 1587.8773469648.

Adding to 4003601645 its reverse (5461063004), we get a palindrome (9464664649).

The spelling of 4003601645 in words is "four billion, three million, six hundred one thousand, six hundred forty-five".