5661216408 has 32 divisors (see below), whose sum is σ = 14160144960. Its totient is φ = 1886124960.

The previous prime is 5661216391. The next prime is 5661216437. The reversal of 5661216408 is 8046121665.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9538 + ... + 106833.

It is an arithmetic number, because the mean of its divisors is an integer number (442504530).

Almost surely, 2^5661216408 is an apocalyptic number.

It is an amenable number.

5661216408 is an abundant number, since it is smaller than the sum of its proper divisors (8498928552).

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

5661216408 is a wasteful number, since it uses less digits than its factorization.

5661216408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118407 (or 118403 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 5661216408 is about 75241.0553355015. The cubic root of 5661216408 is about 1782.2553165500.

The spelling of 5661216408 in words is "five billion, six hundred sixty-one million, two hundred sixteen thousand, four hundred eight".