6648860777 has 4 divisors (see below), whose sum is σ = 7160311620. Its totient is φ = 6137409936.

The previous prime is 6648860753. The next prime is 6648860797. The reversal of 6648860777 is 7770688466.

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 2963278096 + 3685582681 = 54436^2 + 60709^2 .

It is a cyclic number.

It is not a de Polignac number, because 6648860777 - 2²⁴ = 6632083561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6648860707) 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, 255725402 + ... + 255725427.

It is an arithmetic number, because the mean of its divisors is an integer number (1790077905).

Almost surely, 2^6648860777 is an apocalyptic number.

It is an amenable number.

6648860777 is a deficient number, since it is larger than the sum of its proper divisors (511450843).

6648860777 is a wasteful number, since it uses less digits than its factorization.

6648860777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511450842.

The product of its (nonzero) digits is 18966528, while the sum is 59.

The square root of 6648860777 is about 81540.5468279432. The cubic root of 6648860777 is about 1880.3949653983.

The spelling of 6648860777 in words is "six billion, six hundred forty-eight million, eight hundred sixty thousand, seven hundred seventy-seven".