2857666897 has 4 divisors (see below), whose sum is σ = 2860226356. Its totient is φ = 2855107440.

The previous prime is 2857666891. The next prime is 2857666919. The reversal of 2857666897 is 7986667582.

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

It can be written as a sum of positive squares in 2 ways, for example, as 251666496 + 2606000401 = 15864^2 + 51049^2 .

It is a cyclic number.

It is not a de Polignac number, because 2857666897 - 2¹⁹ = 2857142609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2857666891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1278054 + ... + 1280287.

It is an arithmetic number, because the mean of its divisors is an integer number (715056589).

Almost surely, 2^2857666897 is an apocalyptic number.

2857666897 is the 30864-th hex number.

It is an amenable number.

2857666897 is a deficient number, since it is larger than the sum of its proper divisors (2559459).

2857666897 is a wasteful number, since it uses less digits than its factorization.

2857666897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2559458.

The product of its digits is 60963840, while the sum is 64.

The square root of 2857666897 is about 53457.1501017404. The cubic root of 2857666897 is about 1419.0701604512.

The spelling of 2857666897 in words is "two billion, eight hundred fifty-seven million, six hundred sixty-six thousand, eight hundred ninety-seven".