405106665 has 16 divisors (see below), whose sum is σ = 648989376. Its totient is φ = 215784000.

The previous prime is 405106621. The next prime is 405106679. The reversal of 405106665 is 566601504.

It is not a de Polignac number, because 405106665 - 2¹⁰ = 405105641 is a prime.

It is a super-2 number, since 2×405106665² = 328222820054844450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4486 + ... + 28815.

It is an arithmetic number, because the mean of its divisors is an integer number (40561836).

Almost surely, 2^405106665 is an apocalyptic number.

It is an amenable number.

405106665 is a deficient number, since it is larger than the sum of its proper divisors (243882711).

405106665 is a wasteful number, since it uses less digits than its factorization.

405106665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34120.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 405106665 is about 20127.2617362621. The cubic root of 405106665 is about 739.9285693165.

The spelling of 405106665 in words is "four hundred five million, one hundred six thousand, six hundred sixty-five".