5638555381 has 16 divisors (see below), whose sum is σ = 5920625088. Its totient is φ = 5365008000.

The previous prime is 5638555369. The next prime is 5638555421. The reversal of 5638555381 is 1835558365.

It is a cyclic number.

It is not a de Polignac number, because 5638555381 - 2⁷ = 5638555253 is a prime.

It is a super-2 number, since 2×5638555381² = 63586613569208110322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5638555301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267286 + ... + 287608.

It is an arithmetic number, because the mean of its divisors is an integer number (370039068).

Almost surely, 2^5638555381 is an apocalyptic number.

It is an amenable number.

5638555381 is a deficient number, since it is larger than the sum of its proper divisors (282069707).

5638555381 is a wasteful number, since it uses less digits than its factorization.

5638555381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20532.

The product of its digits is 2160000, while the sum is 49.

The square root of 5638555381 is about 75090.3148282120. The cubic root of 5638555381 is about 1779.8741001093.

The spelling of 5638555381 in words is "five billion, six hundred thirty-eight million, five hundred fifty-five thousand, three hundred eighty-one".