6416311621 has 4 divisors (see below), whose sum is σ = 6488405100. Its totient is φ = 6344218144.

The previous prime is 6416311613. The next prime is 6416311651. The reversal of 6416311621 is 1261136146.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3247860100 + 3168451521 = 56990^2 + 56289^2 .

It is a cyclic number.

It is not a de Polignac number, because 6416311621 - 2³ = 6416311613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6416311651) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 36046606 + ... + 36046783.

It is an arithmetic number, because the mean of its divisors is an integer number (1622101275).

Almost surely, 2^6416311621 is an apocalyptic number.

It is an amenable number.

6416311621 is a deficient number, since it is larger than the sum of its proper divisors (72093479).

6416311621 is an equidigital number, since it uses as much as digits as its factorization.

6416311621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72093478.

The product of its digits is 5184, while the sum is 31.

The square root of 6416311621 is about 80101.8827556506. The cubic root of 6416311621 is about 1858.2115252533.

Adding to 6416311621 its reverse (1261136146), we get a palindrome (7677447767).

The spelling of 6416311621 in words is "six billion, four hundred sixteen million, three hundred eleven thousand, six hundred twenty-one".