257218234473 has 4 divisors (see below), whose sum is σ = 342957645968. Its totient is φ = 171478822980.

The previous prime is 257218234451. The next prime is 257218234489. The reversal of 257218234473 is 374432812752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 257218234473 - 2¹³ = 257218226281 is a prime.

It is a super-2 number, since 2×257218234473² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257218234433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42869705743 + ... + 42869705748.

It is an arithmetic number, because the mean of its divisors is an integer number (85739411492).

Almost surely, 2^257218234473 is an apocalyptic number.

It is an amenable number.

257218234473 is a deficient number, since it is larger than the sum of its proper divisors (85739411495).

257218234473 is an equidigital number, since it uses as much as digits as its factorization.

257218234473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85739411494.

The product of its digits is 2257920, while the sum is 48.

The spelling of 257218234473 in words is "two hundred fifty-seven billion, two hundred eighteen million, two hundred thirty-four thousand, four hundred seventy-three".