663345071 has 4 divisors (see below), whose sum is σ = 665313792. Its totient is φ = 661376352.

The previous prime is 663345061. The next prime is 663345103. The reversal of 663345071 is 170543366.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663345071 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 (663345041) 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 3 ways as a sum of consecutive naturals, for example, 983855 + ... + 984528.

It is an arithmetic number, because the mean of its divisors is an integer number (166328448).

Almost surely, 2^663345071 is an apocalyptic number.

663345071 is a deficient number, since it is larger than the sum of its proper divisors (1968721).

663345071 is a wasteful number, since it uses less digits than its factorization.

663345071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1968720.

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 663345071 is about 25755.4862310926. The cubic root of 663345071 is about 872.1272079485.

The spelling of 663345071 in words is "six hundred sixty-three million, three hundred forty-five thousand, seventy-one".