5661216431 has 8 divisors (see below), whose sum is σ = 6107847984. Its totient is φ = 5216178240.

The previous prime is 5661216391. The next prime is 5661216437. The reversal of 5661216431 is 1346121665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5661216431 - 2⁶ = 5661216367 is a prime.

It is a super-2 number, since 2×5661216431² = 64098742957248755522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5661216391 and 5661216400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661216437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390950 + ... + 405171.

It is an arithmetic number, because the mean of its divisors is an integer number (763480998).

Almost surely, 2^5661216431 is an apocalyptic number.

5661216431 is a deficient number, since it is larger than the sum of its proper divisors (446631553).

5661216431 is a wasteful number, since it uses less digits than its factorization.

5661216431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796681.

The product of its digits is 25920, while the sum is 35.

The square root of 5661216431 is about 75241.0554883436. The cubic root of 5661216431 is about 1782.2553189636.

The spelling of 5661216431 in words is "five billion, six hundred sixty-one million, two hundred sixteen thousand, four hundred thirty-one".