3561668778 has 16 divisors (see below), whose sum is σ = 7130064096. Its totient is φ = 1186101840.

The previous prime is 3561668743. The next prime is 3561668783. The reversal of 3561668778 is 8778661653.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273376 + ... + 286107.

It is an arithmetic number, because the mean of its divisors is an integer number (445629006).

Almost surely, 2^3561668778 is an apocalyptic number.

3561668778 is an abundant number, since it is smaller than the sum of its proper divisors (3568395318).

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

3561668778 is a wasteful number, since it uses less digits than its factorization.

3561668778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560549.

The product of its digits is 10160640, while the sum is 57.

The square root of 3561668778 is about 59679.7183136784. The cubic root of 3561668778 is about 1527.1598924918.

The spelling of 3561668778 in words is "three billion, five hundred sixty-one million, six hundred sixty-eight thousand, seven hundred seventy-eight".