6445430641 has 16 divisors (see below), whose sum is σ = 7261304400. Its totient is φ = 5679894528.

The previous prime is 6445430603. The next prime is 6445430657. The reversal of 6445430641 is 1460345446.

It can be written as a sum of positive squares in 8 ways, for example, as 286320241 + 6159110400 = 16921^2 + 78480^2 .

It is not a de Polignac number, because 6445430641 - 2¹¹ = 6445428593 is a prime.

It is a super-2 number, since 2×6445430641² = 83087152295883341762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6445430641.

It is not an unprimeable number, because it can be changed into a prime (6445430671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62496 + ... + 129601.

It is an arithmetic number, because the mean of its divisors is an integer number (453831525).

Almost surely, 2^6445430641 is an apocalyptic number.

It is an amenable number.

6445430641 is a deficient number, since it is larger than the sum of its proper divisors (815873759).

6445430641 is a wasteful number, since it uses less digits than its factorization.

6445430641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192228.

The product of its (nonzero) digits is 138240, while the sum is 37.

The square root of 6445430641 is about 80283.4393944355. The cubic root of 6445430641 is about 1861.0183117233.

The spelling of 6445430641 in words is "six billion, four hundred forty-five million, four hundred thirty thousand, six hundred forty-one".