6440533461 has 6 divisors (see below), whose sum is σ = 9302992790. Its totient is φ = 4293688968.

The previous prime is 6440533409. The next prime is 6440533471. The reversal of 6440533461 is 1643350446.

6440533461 is a `hidden beast` number, since 64 + 4 + 0 + 533 + 4 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6003305361 + 437228100 = 77481^2 + 20910^2 .

It is not a de Polignac number, because 6440533461 - 2¹⁸ = 6440271317 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 (6440533471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 357807406 + ... + 357807423.

Almost surely, 2^6440533461 is an apocalyptic number.

It is an amenable number.

6440533461 is a deficient number, since it is larger than the sum of its proper divisors (2862459329).

6440533461 is a wasteful number, since it uses less digits than its factorization.

6440533461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715614835 (or 715614832 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 6440533461 is about 80252.9342828036. The cubic root of 6440533461 is about 1860.5468639997.

The spelling of 6440533461 in words is "six billion, four hundred forty million, five hundred thirty-three thousand, four hundred sixty-one".