6651111645 has 48 divisors (see below), whose sum is σ = 11809429632. Its totient is φ = 3461028480.

The previous prime is 6651111629. The next prime is 6651111661. The reversal of 6651111645 is 5461111566.

6651111645 is a `hidden beast` number, since 6 + 6 + 5 + 1 + 1 + 1 + 1 + 645 = 666.

It is an interprime number because it is at equal distance from previous prime (6651111629) and next prime (6651111661).

It is not a de Polignac number, because 6651111645 - 2⁴ = 6651111629 is a prime.

It is a super-2 number, since 2×6651111645² = 88474572228509212050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3573015 + ... + 3574875.

It is an arithmetic number, because the mean of its divisors is an integer number (246029784).

Almost surely, 2^6651111645 is an apocalyptic number.

It is an amenable number.

6651111645 is a deficient number, since it is larger than the sum of its proper divisors (5158317987).

6651111645 is a wasteful number, since it uses less digits than its factorization.

6651111645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3762 (or 3759 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 6651111645 is about 81554.3477994889. The cubic root of 6651111645 is about 1880.6071342429.

The spelling of 6651111645 in words is "six billion, six hundred fifty-one million, one hundred eleven thousand, six hundred forty-five".