6603551 has 4 divisors (see below), whose sum is σ = 6609072. Its totient is φ = 6598032.

The previous prime is 6603529. The next prime is 6603557. The reversal of 6603551 is 1553066.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6603551 - 2¹⁸ = 6341407 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 6603551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6603557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131 + ... + 3636.

It is an arithmetic number, because the mean of its divisors is an integer number (1652268).

Almost surely, 2^6603551 is an apocalyptic number.

6603551 is a deficient number, since it is larger than the sum of its proper divisors (5521).

6603551 is a wasteful number, since it uses less digits than its factorization.

6603551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5520.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 6603551 is about 2569.7375352358. The cubic root of 6603551 is about 187.6113803423.

It can be divided in two parts, 6603 and 551, that multiplied together give a triangular number (3638253 = T₂₆₉₇).

The spelling of 6603551 in words is "six million, six hundred three thousand, five hundred fifty-one".