405667663 has 4 divisors (see below), whose sum is σ = 409606288. Its totient is φ = 401729040.

The previous prime is 405667609. The next prime is 405667687. The reversal of 405667663 is 366766504.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 405667663 - 2⁹ = 405667151 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 (405667463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1969158 + ... + 1969363.

It is an arithmetic number, because the mean of its divisors is an integer number (102401572).

Almost surely, 2^405667663 is an apocalyptic number.

405667663 is a deficient number, since it is larger than the sum of its proper divisors (3938625).

405667663 is a wasteful number, since it uses less digits than its factorization.

405667663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3938624.

The product of its (nonzero) digits is 544320, while the sum is 43.

The square root of 405667663 is about 20141.1931870979. The cubic root of 405667663 is about 740.2699666316.

The spelling of 405667663 in words is "four hundred five million, six hundred sixty-seven thousand, six hundred sixty-three".