6651815427 has 24 divisors (see below), whose sum is σ = 9689771520. Its totient is φ = 4396944240.

The previous prime is 6651815381. The next prime is 6651815447. The reversal of 6651815427 is 7245181566.

6651815427 is a `hidden beast` number, since 66 + 518 + 1 + 54 + 27 = 666.

It is not a de Polignac number, because 6651815427 - 2⁸ = 6651815171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6651815447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2402598 + ... + 2405364.

It is an arithmetic number, because the mean of its divisors is an integer number (403740480).

Almost surely, 2^6651815427 is an apocalyptic number.

6651815427 is a deficient number, since it is larger than the sum of its proper divisors (3037956093).

6651815427 is a wasteful number, since it uses less digits than its factorization.

6651815427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4943 (or 4940 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 6651815427 is about 81558.6624890330. The cubic root of 6651815427 is about 1880.6734635445.

The spelling of 6651815427 in words is "six billion, six hundred fifty-one million, eight hundred fifteen thousand, four hundred twenty-seven".