257533920485 has 16 divisors (see below), whose sum is σ = 311046803760. Its totient is φ = 204692520960.

The previous prime is 257533920481. The next prime is 257533920491. The reversal of 257533920485 is 584029335752.

It is a Cunningham number, because it is equal to 507478²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 41419576324 + 216114344161 = 203518^2 + 464881^2 .

It is not a de Polignac number, because 257533920485 - 2² = 257533920481 is a prime.

It is a super-3 number, since 3×257533920485³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257533920481) 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, 568565 + ... + 915605.

It is an arithmetic number, because the mean of its divisors is an integer number (19440425235).

Almost surely, 2^257533920485 is an apocalyptic number.

It is an amenable number.

257533920485 is a deficient number, since it is larger than the sum of its proper divisors (53512883275).

257533920485 is a wasteful number, since it uses less digits than its factorization.

257533920485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348008.

The product of its (nonzero) digits is 9072000, while the sum is 53.

The spelling of 257533920485 in words is "two hundred fifty-seven billion, five hundred thirty-three million, nine hundred twenty thousand, four hundred eighty-five".