6601553 has 4 divisors (see below), whose sum is σ = 7544640. Its totient is φ = 5658468.

The previous prime is 6601549. The next prime is 6601561. The reversal of 6601553 is 3551066.

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: 3551066 = 2 ⋅1775533.

It is a cyclic number.

It is not a de Polignac number, because 6601553 - 2² = 6601549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6601513) 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, 471533 + ... + 471546.

It is an arithmetic number, because the mean of its divisors is an integer number (1886160).

Almost surely, 2^6601553 is an apocalyptic number.

It is an amenable number.

6601553 is a deficient number, since it is larger than the sum of its proper divisors (943087).

6601553 is an equidigital number, since it uses as much as digits as its factorization.

6601553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943086.

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

The square root of 6601553 is about 2569.3487501700. The cubic root of 6601553 is about 187.5924569202.

The spelling of 6601553 in words is "six million, six hundred one thousand, five hundred fifty-three".