663545461 has 4 divisors (see below), whose sum is σ = 664759072. Its totient is φ = 662331852.

The previous prime is 663545459. The next prime is 663545489. The reversal of 663545461 is 164545366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 164545366 = 2 ⋅82272683.

It is a cyclic number.

It is not a de Polignac number, because 663545461 - 2¹ = 663545459 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 (663545761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 605985 + ... + 607078.

It is an arithmetic number, because the mean of its divisors is an integer number (166189768).

Almost surely, 2^663545461 is an apocalyptic number.

It is an amenable number.

663545461 is a deficient number, since it is larger than the sum of its proper divisors (1213611).

663545461 is a wasteful number, since it uses less digits than its factorization.

663545461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213610.

The product of its digits is 259200, while the sum is 40.

The square root of 663545461 is about 25759.3761764527. The cubic root of 663545461 is about 872.2150194479.

The spelling of 663545461 in words is "six hundred sixty-three million, five hundred forty-five thousand, four hundred sixty-one".