257143477645 has 8 divisors (see below), whose sum is σ = 308636075520. Its totient is φ = 205672180560.

The previous prime is 257143477627. The next prime is 257143477649. The reversal of 257143477645 is 546774341752.

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

It is not a de Polignac number, because 257143477645 - 2¹⁹ = 257142953357 is a prime.

It is a super-3 number, since 3×257143477645³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257143477649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5298625 + ... + 5346934.

It is an arithmetic number, because the mean of its divisors is an integer number (38579509440).

Almost surely, 2^257143477645 is an apocalyptic number.

It is an amenable number.

257143477645 is a deficient number, since it is larger than the sum of its proper divisors (51492597875).

257143477645 is a wasteful number, since it uses less digits than its factorization.

257143477645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10650395.

The product of its digits is 19756800, while the sum is 55.

The spelling of 257143477645 in words is "two hundred fifty-seven billion, one hundred forty-three million, four hundred seventy-seven thousand, six hundred forty-five".