6511280885 has 4 divisors (see below), whose sum is σ = 7813537068. Its totient is φ = 5209024704.

The previous prime is 6511280873. The next prime is 6511280903. The reversal of 6511280885 is 5880821156.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2885193796 + 3626087089 = 53714^2 + 60217^2 .

It is a cyclic number.

It is not a de Polignac number, because 6511280885 - 2⁴ = 6511280869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651128084 + ... + 651128093.

It is an arithmetic number, because the mean of its divisors is an integer number (1953384267).

Almost surely, 2^6511280885 is an apocalyptic number.

It is an amenable number.

6511280885 is a deficient number, since it is larger than the sum of its proper divisors (1302256183).

6511280885 is a wasteful number, since it uses less digits than its factorization.

6511280885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302256182.

The product of its (nonzero) digits is 153600, while the sum is 44.

The square root of 6511280885 is about 80692.5082334166. The cubic root of 6511280885 is about 1867.3345962022.

The spelling of 6511280885 in words is "six billion, five hundred eleven million, two hundred eighty thousand, eight hundred eighty-five".