6601111255 has 4 divisors (see below), whose sum is σ = 7921333512. Its totient is φ = 5280889000.

The previous prime is 6601111249. The next prime is 6601111259. The reversal of 6601111255 is 5521111066.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6601111255 - 2¹⁵ = 6601078487 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 (6601111259) 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, 660111121 + ... + 660111130.

It is an arithmetic number, because the mean of its divisors is an integer number (1980333378).

Almost surely, 2^6601111255 is an apocalyptic number.

6601111255 is a deficient number, since it is larger than the sum of its proper divisors (1320222257).

6601111255 is a wasteful number, since it uses less digits than its factorization.

6601111255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320222256.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 6601111255 is about 81247.2230602376. The cubic root of 6601111255 is about 1875.8827255739.

The spelling of 6601111255 in words is "six billion, six hundred one million, one hundred eleven thousand, two hundred fifty-five".