6620155 has 8 divisors (see below), whose sum is σ = 7967232. Its totient is φ = 5280768.

The previous prime is 6620101. The next prime is 6620171. The reversal of 6620155 is 5510266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6620155 - 2⁷ = 6620027 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187 + ... + 3643.

It is an arithmetic number, because the mean of its divisors is an integer number (995904).

Almost surely, 2^6620155 is an apocalyptic number.

6620155 is a deficient number, since it is larger than the sum of its proper divisors (1347077).

6620155 is a wasteful number, since it uses less digits than its factorization.

6620155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3845.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 6620155 is about 2572.9661871078. The cubic root of 6620155 is about 187.7684923833.

The spelling of 6620155 in words is "six million, six hundred twenty thousand, one hundred fifty-five".