2257640897 has 2 divisors, whose sum is σ = 2257640898. Its totient is φ = 2257640896.

The previous prime is 2257640893. The next prime is 2257640921. The reversal of 2257640897 is 7980467522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2245243456 + 12397441 = 47384^2 + 3521^2 .

It is a cyclic number.

It is not a de Polignac number, because 2257640897 - 2² = 2257640893 is a prime.

It is not a weakly prime, because it can be changed into another prime (2257640893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1128820448 + 1128820449.

It is an arithmetic number, because the mean of its divisors is an integer number (1128820449).

Almost surely, 2^2257640897 is an apocalyptic number.

It is an amenable number.

2257640897 is a deficient number, since it is larger than the sum of its proper divisors (1).

2257640897 is an equidigital number, since it uses as much as digits as its factorization.

2257640897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The square root of 2257640897 is about 47514.6387653321. The cubic root of 2257640897 is about 1311.8523408038.

The spelling of 2257640897 in words is "two billion, two hundred fifty-seven million, six hundred forty thousand, eight hundred ninety-seven".