2657845209 has 16 divisors (see below), whose sum is σ = 3578826240. Its totient is φ = 1754403840.

The previous prime is 2657845207. The next prime is 2657845217. The reversal of 2657845209 is 9025487562.

It is not a de Polignac number, because 2657845209 - 2¹ = 2657845207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2657845207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 845689 + ... + 848825.

It is an arithmetic number, because the mean of its divisors is an integer number (223676640).

Almost surely, 2^2657845209 is an apocalyptic number.

It is an amenable number.

2657845209 is a deficient number, since it is larger than the sum of its proper divisors (920981031).

2657845209 is a wasteful number, since it uses less digits than its factorization.

2657845209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5840.

The product of its (nonzero) digits is 1209600, while the sum is 48.

The square root of 2657845209 is about 51554.2937978982. The cubic root of 2657845209 is about 1385.1917451862.

The spelling of 2657845209 in words is "two billion, six hundred fifty-seven million, eight hundred forty-five thousand, two hundred nine".