257138063471 has 4 divisors (see below), whose sum is σ = 265432839744. Its totient is φ = 248843287200.

The previous prime is 257138063443. The next prime is 257138063503. The reversal of 257138063471 is 174360831752.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 257138063471 - 2⁶ = 257138063407 is a prime.

It is a super-3 number, since 3×257138063471³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257138063411) 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, 4147388090 + ... + 4147388151.

It is an arithmetic number, because the mean of its divisors is an integer number (66358209936).

Almost surely, 2^257138063471 is an apocalyptic number.

257138063471 is a deficient number, since it is larger than the sum of its proper divisors (8294776273).

257138063471 is an equidigital number, since it uses as much as digits as its factorization.

257138063471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8294776272.

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 257138063471 in words is "two hundred fifty-seven billion, one hundred thirty-eight million, sixty-three thousand, four hundred seventy-one".