257690245449 has 96 divisors (see below), whose sum is σ = 433460729856. Its totient is φ = 134970675840.

The previous prime is 257690245441. The next prime is 257690245487. The reversal of 257690245449 is 944542096752.

It is not a de Polignac number, because 257690245449 - 2³ = 257690245441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257690245441) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 194189424 + ... + 194190750.

It is an arithmetic number, because the mean of its divisors is an integer number (4515215936).

Almost surely, 2^257690245449 is an apocalyptic number.

It is an amenable number.

257690245449 is a deficient number, since it is larger than the sum of its proper divisors (175770484407).

257690245449 is a wasteful number, since it uses less digits than its factorization.

257690245449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995 (or 1988 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 57.

The spelling of 257690245449 in words is "two hundred fifty-seven billion, six hundred ninety million, two hundred forty-five thousand, four hundred forty-nine".