6651111651 has 4 divisors (see below), whose sum is σ = 8868148872. Its totient is φ = 4434074432.

The previous prime is 6651111629. The next prime is 6651111661. The reversal of 6651111651 is 1561111566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6651111651 - 2³⁰ = 5577369827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6651111661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1108518606 + ... + 1108518611.

It is an arithmetic number, because the mean of its divisors is an integer number (2217037218).

Almost surely, 2^6651111651 is an apocalyptic number.

6651111651 is a deficient number, since it is larger than the sum of its proper divisors (2217037221).

6651111651 is a wasteful number, since it uses less digits than its factorization.

6651111651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217037220.

The product of its digits is 5400, while the sum is 33.

The square root of 6651111651 is about 81554.3478362742. The cubic root of 6651111651 is about 1880.6071348084.

The spelling of 6651111651 in words is "six billion, six hundred fifty-one million, one hundred eleven thousand, six hundred fifty-one".