4001636445 has 8 divisors (see below), whose sum is σ = 6402618336. Its totient is φ = 2134206096.

The previous prime is 4001636411. The next prime is 4001636479. The reversal of 4001636445 is 5446361004.

It is an interprime number because it is at equal distance from previous prime (4001636411) and next prime (4001636479).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4001636445 - 2³⁰ = 2927894621 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133387867 + ... + 133387896.

It is an arithmetic number, because the mean of its divisors is an integer number (800327292).

Almost surely, 2^4001636445 is an apocalyptic number.

It is an amenable number.

4001636445 is a deficient number, since it is larger than the sum of its proper divisors (2400981891).

4001636445 is a wasteful number, since it uses less digits than its factorization.

4001636445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266775771.

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 4001636445 is about 63258.4891141102. The cubic root of 4001636445 is about 1587.6174969971.

Adding to 4001636445 its reverse (5446361004), we get a palindrome (9447997449).

The spelling of 4001636445 in words is "four billion, one million, six hundred thirty-six thousand, four hundred forty-five".