6440296621 has 8 divisors (see below), whose sum is σ = 7072308288. Its totient is φ = 5816040000.

The previous prime is 6440296561. The next prime is 6440296637. The reversal of 6440296621 is 1266920446.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6440296621 - 2¹⁷ = 6440165549 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 (6440296651) 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, 1937020 + ... + 1940341.

It is an arithmetic number, because the mean of its divisors is an integer number (884038536).

Almost surely, 2^6440296621 is an apocalyptic number.

It is an amenable number.

6440296621 is a deficient number, since it is larger than the sum of its proper divisors (632011667).

6440296621 is a wasteful number, since it uses less digits than its factorization.

6440296621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3877523.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 6440296621 is about 80251.4586845622. The cubic root of 6440296621 is about 1860.5240575390.

The spelling of 6440296621 in words is "six billion, four hundred forty million, two hundred ninety-six thousand, six hundred twenty-one".