663670553 has 12 divisors (see below), whose sum is σ = 831412260. Its totient is φ = 525101472.

The previous prime is 663670529. The next prime is 663670621. The reversal of 663670553 is 355076366.

It can be written as a sum of positive squares in 2 ways, for example, as 55160329 + 608510224 = 7427^2 + 24668^2 .

It is not a de Polignac number, because 663670553 - 2¹² = 663666457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 663670553.

It is not an unprimeable number, because it can be changed into a prime (663670453) 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 11 ways as a sum of consecutive naturals, for example, 520298 + ... + 521571.

It is an arithmetic number, because the mean of its divisors is an integer number (69284355).

Almost surely, 2^663670553 is an apocalyptic number.

It is an amenable number.

663670553 is a deficient number, since it is larger than the sum of its proper divisors (167741707).

663670553 is a wasteful number, since it uses less digits than its factorization.

663670553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041896 (or 1041889 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 41.

The square root of 663670553 is about 25761.8041487781. The cubic root of 663670553 is about 872.2698261753.

The spelling of 663670553 in words is "six hundred sixty-three million, six hundred seventy thousand, five hundred fifty-three".