6545444661 has 12 divisors (see below), whose sum is σ = 10805178592. Its totient is φ = 3740254056.

The previous prime is 6545444651. The next prime is 6545444671. The reversal of 6545444661 is 1664445456.

6545444661 is a `hidden beast` number, since 6 + 5 + 4 + 544 + 46 + 61 = 666.

It is an interprime number because it is at equal distance from previous prime (6545444651) and next prime (6545444671).

It is not a de Polignac number, because 6545444661 - 2⁵ = 6545444629 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 (6545444611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51947911 + ... + 51948036.

Almost surely, 2^6545444661 is an apocalyptic number.

It is an amenable number.

6545444661 is a deficient number, since it is larger than the sum of its proper divisors (4259733931).

6545444661 is a wasteful number, since it uses less digits than its factorization.

6545444661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103895960 (or 103895957 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 45.

The square root of 6545444661 is about 80903.9224080019. The cubic root of 6545444661 is about 1870.5947816796.

The spelling of 6545444661 in words is "six billion, five hundred forty-five million, four hundred forty-four thousand, six hundred sixty-one".