663374161 has 4 divisors (see below), whose sum is σ = 669942324. Its totient is φ = 656806000.

The previous prime is 663374149. The next prime is 663374167. The reversal of 663374161 is 161473366.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 340956225 + 322417936 = 18465^2 + 17956^2 .

It is a cyclic number.

It is not a de Polignac number, because 663374161 - 2²¹ = 661277009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 663374161.

It is not an unprimeable number, because it can be changed into a prime (663374167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3283930 + ... + 3284131.

It is an arithmetic number, because the mean of its divisors is an integer number (167485581).

Almost surely, 2^663374161 is an apocalyptic number.

It is an amenable number.

663374161 is a deficient number, since it is larger than the sum of its proper divisors (6568163).

663374161 is a wasteful number, since it uses less digits than its factorization.

663374161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6568162.

The product of its digits is 54432, while the sum is 37.

The square root of 663374161 is about 25756.0509589494. The cubic root of 663374161 is about 872.1399563710.

The spelling of 663374161 in words is "six hundred sixty-three million, three hundred seventy-four thousand, one hundred sixty-one".