6601551 has 16 divisors (see below), whose sum is σ = 9652608. Its totient is φ = 3980000.

The previous prime is 6601549. The next prime is 6601561. The reversal of 6601551 is 1551066.

It is a cyclic number.

It is not a de Polignac number, because 6601551 - 2¹ = 6601549 is a prime.

6601551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6601501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7885 + ... + 8681.

It is an arithmetic number, because the mean of its divisors is an integer number (603288).

Almost surely, 2^6601551 is an apocalyptic number.

6601551 is a deficient number, since it is larger than the sum of its proper divisors (3051057).

6601551 is a wasteful number, since it uses less digits than its factorization.

6601551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 6601551 is about 2569.3483609663. The cubic root of 6601551 is about 187.5924379759.

It can be divided in two parts, 66015 and 51, that added together give a palindrome (66066).

The spelling of 6601551 in words is "six million, six hundred one thousand, five hundred fifty-one".