405540040671 has 6 divisors (see below), whose sum is σ = 585780058760. Its totient is φ = 270360027108.

The previous prime is 405540040651. The next prime is 405540040699. The reversal of 405540040671 is 176040045504.

405540040671 is a `hidden beast` number, since 4 + 0 + 5 + 540 + 0 + 40 + 6 + 71 = 666.

It is not a de Polignac number, because 405540040671 - 2¹¹ = 405540038623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405540040651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22530002251 + ... + 22530002268.

Almost surely, 2^405540040671 is an apocalyptic number.

405540040671 is a deficient number, since it is larger than the sum of its proper divisors (180240018089).

405540040671 is a wasteful number, since it uses less digits than its factorization.

405540040671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45060004525 (or 45060004522 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The spelling of 405540040671 in words is "four hundred five billion, five hundred forty million, forty thousand, six hundred seventy-one".