5405565681 has 12 divisors (see below), whose sum is σ = 7848921600. Its totient is φ = 3584841720.

The previous prime is 5405565637. The next prime is 5405565709. The reversal of 5405565681 is 1865655045.

5405565681 is a `hidden beast` number, since 5 + 4 + 0 + 5 + 565 + 6 + 81 = 666.

It is not a de Polignac number, because 5405565681 - 2¹⁴ = 5405549297 is a prime.

It is a super-2 number, since 2×5405565681² = 58440280663209987522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (5405565611) 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, 1570581 + ... + 1574018.

It is an arithmetic number, because the mean of its divisors is an integer number (654076800).

Almost surely, 2^5405565681 is an apocalyptic number.

It is an amenable number.

5405565681 is a deficient number, since it is larger than the sum of its proper divisors (2443355919).

5405565681 is a wasteful number, since it uses less digits than its factorization.

5405565681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3144796 (or 3144793 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 45.

The square root of 5405565681 is about 73522.5521931876. The cubic root of 5405565681 is about 1755.0131822615.

The spelling of 5405565681 in words is "five billion, four hundred five million, five hundred sixty-five thousand, six hundred eighty-one".