6651061657 has 16 divisors (see below), whose sum is σ = 7112366352. Its totient is φ = 6197852160.

The previous prime is 6651061631. The next prime is 6651061661. The reversal of 6651061657 is 7561601566.

It can be written as a sum of positive squares in 8 ways, for example, as 209554576 + 6441507081 = 14476^2 + 80259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6651061657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6651061667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 712303 + ... + 721579.

It is an arithmetic number, because the mean of its divisors is an integer number (444522897).

Almost surely, 2^6651061657 is an apocalyptic number.

It is an amenable number.

6651061657 is a deficient number, since it is larger than the sum of its proper divisors (461304695).

6651061657 is a wasteful number, since it uses less digits than its factorization.

6651061657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9708.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 6651061657 is about 81554.0413284345. The cubic root of 6651061657 is about 1880.6024228488.

The spelling of 6651061657 in words is "six billion, six hundred fifty-one million, sixty-one thousand, six hundred fifty-seven".