3561563378 has 4 divisors (see below), whose sum is σ = 5342345070. Its totient is φ = 1780781688.

The previous prime is 3561563329. The next prime is 3561563387. The reversal of 3561563378 is 8733651653.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8733651653 = 7741 ⋅1128233.

It can be written as a sum of positive squares in only one way, i.e., 2560663609 + 1000899769 = 50603^2 + 31637^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 890390843 + ... + 890390846.

Almost surely, 2^3561563378 is an apocalyptic number.

3561563378 is a deficient number, since it is larger than the sum of its proper divisors (1780781692).

3561563378 is a wasteful number, since it uses less digits than its factorization.

3561563378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780781691.

The product of its digits is 1360800, while the sum is 47.

The square root of 3561563378 is about 59678.8352600819. The cubic root of 3561563378 is about 1527.1448279953.

The spelling of 3561563378 in words is "three billion, five hundred sixty-one million, five hundred sixty-three thousand, three hundred seventy-eight".