6649017155 has 16 divisors (see below), whose sum is σ = 8776111968. Its totient is φ = 4835644000.

The previous prime is 6649017139. The next prime is 6649017161. The reversal of 6649017155 is 5517109466.

It is not a de Polignac number, because 6649017155 - 2⁴ = 6649017139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 492896 + ... + 506205.

It is an arithmetic number, because the mean of its divisors is an integer number (548506998).

Almost surely, 2^6649017155 is an apocalyptic number.

6649017155 is a deficient number, since it is larger than the sum of its proper divisors (2127094813).

6649017155 is an equidigital number, since it uses as much as digits as its factorization.

6649017155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999139 (or 999117 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 44.

The square root of 6649017155 is about 81541.5057194801. The cubic root of 6649017155 is about 1880.4097072771.

The spelling of 6649017155 in words is "six billion, six hundred forty-nine million, seventeen thousand, one hundred fifty-five".