161404663 has 16 divisors (see below), whose sum is σ = 190356480. Its totient is φ = 133994016.

The previous prime is 161404657. The next prime is 161404669. The reversal of 161404663 is 366404161.

It is an interprime number because it is at equal distance from previous prime (161404657) and next prime (161404669).

It is a cyclic number.

It is not a de Polignac number, because 161404663 - 2⁹ = 161404151 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 (161404669) 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 15 ways as a sum of consecutive naturals, for example, 26556 + ... + 32062.

It is an arithmetic number, because the mean of its divisors is an integer number (11897280).

Almost surely, 2^161404663 is an apocalyptic number.

161404663 is a deficient number, since it is larger than the sum of its proper divisors (28951817).

161404663 is an equidigital number, since it uses as much as digits as its factorization.

161404663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5646.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 161404663 is about 12704.5134893076. The cubic root of 161404663 is about 544.4675809302.

The spelling of 161404663 in words is "one hundred sixty-one million, four hundred four thousand, six hundred sixty-three".