257721067245 has 8 divisors (see below), whose sum is σ = 412353707616. Its totient is φ = 137451235856.

The previous prime is 257721067159. The next prime is 257721067271. The reversal of 257721067245 is 542760127752.

It is a happy number.

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 257721067245 - 2¹¹ = 257721065197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 257721067194 and 257721067203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8590702227 + ... + 8590702256.

It is an arithmetic number, because the mean of its divisors is an integer number (51544213452).

Almost surely, 2^257721067245 is an apocalyptic number.

It is an amenable number.

257721067245 is a deficient number, since it is larger than the sum of its proper divisors (154632640371).

257721067245 is a wasteful number, since it uses less digits than its factorization.

257721067245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17181404491.

The product of its (nonzero) digits is 1646400, while the sum is 48.

The spelling of 257721067245 in words is "two hundred fifty-seven billion, seven hundred twenty-one million, sixty-seven thousand, two hundred forty-five".