2856655661 has 2 divisors, whose sum is σ = 2856655662. Its totient is φ = 2856655660.

The previous prime is 2856655657. The next prime is 2856655667. The reversal of 2856655661 is 1665566582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2833432900 + 23222761 = 53230^2 + 4819^2 .

It is a cyclic number.

It is not a de Polignac number, because 2856655661 - 2² = 2856655657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2856655667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1428327830 + 1428327831.

It is an arithmetic number, because the mean of its divisors is an integer number (1428327831).

Almost surely, 2^2856655661 is an apocalyptic number.

It is an amenable number.

2856655661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2856655661 is an equidigital number, since it uses as much as digits as its factorization.

2856655661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592000, while the sum is 50.

The square root of 2856655661 is about 53447.6908855752. The cubic root of 2856655661 is about 1418.9027530070.

The spelling of 2856655661 in words is "two billion, eight hundred fifty-six million, six hundred fifty-five thousand, six hundred sixty-one".