257016505 has 16 divisors (see below), whose sum is σ = 318864384. Its totient is φ = 198671040.

The previous prime is 257016503. The next prime is 257016509. The reversal of 257016505 is 505610752.

It is not a de Polignac number, because 257016505 - 2¹ = 257016503 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257016503) 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, 187332 + ... + 188698.

It is an arithmetic number, because the mean of its divisors is an integer number (19929024).

Almost surely, 2^257016505 is an apocalyptic number.

It is an amenable number.

257016505 is a deficient number, since it is larger than the sum of its proper divisors (61847879).

257016505 is a wasteful number, since it uses less digits than its factorization.

257016505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2616.

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 257016505 is about 16031.7343104232. The cubic root of 257016505 is about 635.7997281229.

The spelling of 257016505 in words is "two hundred fifty-seven million, sixteen thousand, five hundred five".