405016661 has 8 divisors (see below), whose sum is σ = 468077760. Its totient is φ = 343255968.

The previous prime is 405016649. The next prime is 405016709. The reversal of 405016661 is 166610504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405016661 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 (405016961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324431 + ... + 325676.

It is an arithmetic number, because the mean of its divisors is an integer number (58509720).

Almost surely, 2^405016661 is an apocalyptic number.

It is an amenable number.

405016661 is a deficient number, since it is larger than the sum of its proper divisors (63061099).

405016661 is an equidigital number, since it uses as much as digits as its factorization.

405016661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650203.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 405016661 is about 20125.0257391140. The cubic root of 405016661 is about 739.8737677302.

The spelling of 405016661 in words is "four hundred five million, sixteen thousand, six hundred sixty-one".