6648774155 has 4 divisors (see below), whose sum is σ = 7978528992. Its totient is φ = 5319019320.

The previous prime is 6648774109. The next prime is 6648774199. The reversal of 6648774155 is 5514778466.

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

It is a de Polignac number, because none of the positive numbers 2^k-6648774155 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6648774097 and 6648774106.

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, 664877411 + ... + 664877420.

It is an arithmetic number, because the mean of its divisors is an integer number (1994632248).

Almost surely, 2^6648774155 is an apocalyptic number.

6648774155 is a deficient number, since it is larger than the sum of its proper divisors (1329754837).

6648774155 is a wasteful number, since it uses less digits than its factorization.

6648774155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329754836.

The product of its digits is 5644800, while the sum is 53.

The square root of 6648774155 is about 81540.0156671557. The cubic root of 6648774155 is about 1880.3867993738.

The spelling of 6648774155 in words is "six billion, six hundred forty-eight million, seven hundred seventy-four thousand, one hundred fifty-five".