257218049869 has 8 divisors (see below), whose sum is σ = 280630814112. Its totient is φ = 233810169840.

The previous prime is 257218049863. The next prime is 257218049903. The reversal of 257218049869 is 968940812752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 257218049869 - 2²⁵ = 257184495437 is a prime.

It is a super-2 number, since 2×257218049869² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257218049863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1110499 + ... + 1321984.

It is an arithmetic number, because the mean of its divisors is an integer number (35078851764).

Almost surely, 2^257218049869 is an apocalyptic number.

It is an amenable number.

257218049869 is a deficient number, since it is larger than the sum of its proper divisors (23412764243).

257218049869 is a wasteful number, since it uses less digits than its factorization.

257218049869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2442107.

The product of its (nonzero) digits is 17418240, while the sum is 61.

The spelling of 257218049869 in words is "two hundred fifty-seven billion, two hundred eighteen million, forty-nine thousand, eight hundred sixty-nine".