6649781274 has 24 divisors (see below), whose sum is σ = 14413112532. Its totient is φ = 2215785600.

The previous prime is 6649781273. The next prime is 6649781293. The reversal of 6649781274 is 4721879466.

6649781274 is a `hidden beast` number, since 6 + 6 + 497 + 81 + 2 + 74 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6631659225 + 18122049 = 81435^2 + 4257^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6649781274.

It is not an unprimeable number, because it can be changed into a prime (6649781273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15529 + ... + 116364.

Almost surely, 2^6649781274 is an apocalyptic number.

6649781274 is an abundant number, since it is smaller than the sum of its proper divisors (7763331258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6649781274 is a wasteful number, since it uses less digits than its factorization.

6649781274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134702 (or 134699 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The square root of 6649781274 is about 81546.1910453211. The cubic root of 6649781274 is about 1880.4817380606.

The spelling of 6649781274 in words is "six billion, six hundred forty-nine million, seven hundred eighty-one thousand, two hundred seventy-four".