4001638557 has 12 divisors (see below), whose sum is σ = 6206623296. Its totient is φ = 2286650520.

The previous prime is 4001638549. The next prime is 4001638639. The reversal of 4001638557 is 7558361004.

4001638557 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4001638557 - 2³ = 4001638549 is a prime.

It is a super-2 number, since 2×4001638557² = 32026222281738084498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4001630557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13610869 + ... + 13611162.

It is an arithmetic number, because the mean of its divisors is an integer number (517218608).

Almost surely, 2^4001638557 is an apocalyptic number.

It is an amenable number.

4001638557 is a deficient number, since it is larger than the sum of its proper divisors (2204984739).

4001638557 is a wasteful number, since it uses less digits than its factorization.

4001638557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27222048 (or 27222041 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 4001638557 is about 63258.5058075197. The cubic root of 4001638557 is about 1587.6177763034.

The spelling of 4001638557 in words is "four billion, one million, six hundred thirty-eight thousand, five hundred fifty-seven".