5649945381 has 12 divisors (see below), whose sum is σ = 8282839552. Its totient is φ = 3710411496.

The previous prime is 5649945337. The next prime is 5649945419. The reversal of 5649945381 is 1835499465.

5649945381 is a `hidden beast` number, since 564 + 9 + 9 + 45 + 38 + 1 = 666.

It is not a de Polignac number, because 5649945381 - 2¹⁹ = 5649421093 is a prime.

It is a super-2 number, since 2×5649945381² = 63843765616566470322, 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 (5649945781) 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, 4684261 + ... + 4685466.

Almost surely, 2^5649945381 is an apocalyptic number.

It is an amenable number.

5649945381 is a deficient number, since it is larger than the sum of its proper divisors (2632894171).

5649945381 is a wasteful number, since it uses less digits than its factorization.

5649945381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9369800 (or 9369797 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The square root of 5649945381 is about 75166.1185708029. The cubic root of 5649945381 is about 1781.0717550321.

The spelling of 5649945381 in words is "five billion, six hundred forty-nine million, nine hundred forty-five thousand, three hundred eighty-one".