405251663 has 4 divisors (see below), whose sum is σ = 405652728. Its totient is φ = 404850600.

The previous prime is 405251659. The next prime is 405251677. The reversal of 405251663 is 366152504.

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 405251663 - 2² = 405251659 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 (405251603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199013 + ... + 201038.

It is an arithmetic number, because the mean of its divisors is an integer number (101413182).

Almost surely, 2^405251663 is an apocalyptic number.

405251663 is a deficient number, since it is larger than the sum of its proper divisors (401065).

405251663 is a wasteful number, since it uses less digits than its factorization.

405251663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401064.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 405251663 is about 20130.8634439758. The cubic root of 405251663 is about 740.0168385504.

The spelling of 405251663 in words is "four hundred five million, two hundred fifty-one thousand, six hundred sixty-three".