5661543478 has 4 divisors (see below), whose sum is σ = 8492315220. Its totient is φ = 2830771738.

The previous prime is 5661543469. The next prime is 5661543497. The reversal of 5661543478 is 8743451665.

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

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1415385868 + ... + 1415385871.

It is an arithmetic number, because the mean of its divisors is an integer number (2123078805).

Almost surely, 2^5661543478 is an apocalyptic number.

5661543478 is a deficient number, since it is larger than the sum of its proper divisors (2830771742).

5661543478 is a wasteful number, since it uses less digits than its factorization.

5661543478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2830771741.

The product of its digits is 2419200, while the sum is 49.

The square root of 5661543478 is about 75243.2287850541. The cubic root of 5661543478 is about 1782.2896384447.

The spelling of 5661543478 in words is "five billion, six hundred sixty-one million, five hundred forty-three thousand, four hundred seventy-eight".