405016663 has 4 divisors (see below), whose sum is σ = 405094960. Its totient is φ = 404938368.

The previous prime is 405016649. The next prime is 405016709. The reversal of 405016663 is 366610504.

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 405016663 - 2²¹ = 402919511 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 (405016063) 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, 30795 + ... + 41932.

It is an arithmetic number, because the mean of its divisors is an integer number (101273740).

Almost surely, 2^405016663 is an apocalyptic number.

405016663 is a deficient number, since it is larger than the sum of its proper divisors (78297).

405016663 is an equidigital number, since it uses as much as digits as its factorization.

405016663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78296.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 405016663 is about 20125.0257888034. The cubic root of 405016663 is about 739.8737689481.

The spelling of 405016663 in words is "four hundred five million, sixteen thousand, six hundred sixty-three".