5661216406 has 4 divisors (see below), whose sum is σ = 8491824612. Its totient is φ = 2830608202.

The previous prime is 5661216391. The next prime is 5661216437. The reversal of 5661216406 is 6046121665.

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

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, 1415304100 + ... + 1415304103.

It is an arithmetic number, because the mean of its divisors is an integer number (2122956153).

Almost surely, 2^5661216406 is an apocalyptic number.

5661216406 is a deficient number, since it is larger than the sum of its proper divisors (2830608206).

5661216406 is a wasteful number, since it uses less digits than its factorization.

5661216406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830608205.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 5661216406 is about 75241.0553222109. The cubic root of 5661216406 is about 1782.2553163401.

The spelling of 5661216406 in words is "five billion, six hundred sixty-one million, two hundred sixteen thousand, four hundred six".