257956921485 has 32 divisors (see below), whose sum is σ = 458615189760. Its totient is φ = 137569492800.

The previous prime is 257956921441. The next prime is 257956921499. The reversal of 257956921485 is 584129659752.

257956921485 is a `hidden beast` number, since 2 + 5 + 7 + 9 + 569 + 21 + 48 + 5 = 666.

It is not a de Polignac number, because 257956921485 - 2¹⁰ = 257956920461 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3142920 + ... + 3223950.

It is an arithmetic number, because the mean of its divisors is an integer number (14331724680).

Almost surely, 2^257956921485 is an apocalyptic number.

It is an amenable number.

257956921485 is a deficient number, since it is larger than the sum of its proper divisors (200658268275).

257956921485 is a wasteful number, since it uses less digits than its factorization.

257956921485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104626 (or 104620 counting only the distinct ones).

The product of its digits is 54432000, while the sum is 63.

The spelling of 257956921485 in words is "two hundred fifty-seven billion, nine hundred fifty-six million, nine hundred twenty-one thousand, four hundred eighty-five".