6651615651 has 4 divisors (see below), whose sum is σ = 8868820872. Its totient is φ = 4434410432.

The previous prime is 6651615637. The next prime is 6651615701. The reversal of 6651615651 is 1565161566.

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 6651615651 - 2¹¹ = 6651613603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6651615611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1108602606 + ... + 1108602611.

It is an arithmetic number, because the mean of its divisors is an integer number (2217205218).

Almost surely, 2^6651615651 is an apocalyptic number.

6651615651 is a deficient number, since it is larger than the sum of its proper divisors (2217205221).

6651615651 is a wasteful number, since it uses less digits than its factorization.

6651615651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2217205220.

The product of its digits is 162000, while the sum is 42.

The square root of 6651615651 is about 81557.4377417535. The cubic root of 6651615651 is about 1880.6546357429.

It can be divided in two parts, 665161565 and 1, that added together give a palindrome (665161566).

The spelling of 6651615651 in words is "six billion, six hundred fifty-one million, six hundred fifteen thousand, six hundred fifty-one".