6403644461 has 16 divisors (see below), whose sum is σ = 6935102400. Its totient is φ = 5894114688.

The previous prime is 6403644451. The next prime is 6403644523. The reversal of 6403644461 is 1644463046.

It is a cyclic number.

It is not a de Polignac number, because 6403644461 - 2²² = 6399450157 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 (6403644451) 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, 58475 + ... + 127383.

It is an arithmetic number, because the mean of its divisors is an integer number (433443900).

Almost surely, 2^6403644461 is an apocalyptic number.

It is an amenable number.

6403644461 is a deficient number, since it is larger than the sum of its proper divisors (531457939).

6403644461 is a wasteful number, since it uses less digits than its factorization.

6403644461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69068.

The product of its (nonzero) digits is 165888, while the sum is 38.

The square root of 6403644461 is about 80022.7746394737. The cubic root of 6403644461 is about 1856.9878851026.

The spelling of 6403644461 in words is "six billion, four hundred three million, six hundred forty-four thousand, four hundred sixty-one".