257207212206 has 48 divisors (see below), whose sum is σ = 658855922400. Its totient is φ = 70953712704.

The previous prime is 257207212109. The next prime is 257207212217. The reversal of 257207212206 is 602212702752.

257207212206 is a `hidden beast` number, since 2 + 572 + 0 + 72 + 12 + 2 + 0 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 35191641 + ... + 35198948.

It is an arithmetic number, because the mean of its divisors is an integer number (13726165050).

Almost surely, 2^257207212206 is an apocalyptic number.

257207212206 is an abundant number, since it is smaller than the sum of its proper divisors (401648710194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257207212206 is a wasteful number, since it uses less digits than its factorization.

257207212206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70390633 (or 70390630 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

Adding to 257207212206 its reverse (602212702752), we get a palindrome (859419914958).

The spelling of 257207212206 in words is "two hundred fifty-seven billion, two hundred seven million, two hundred twelve thousand, two hundred six".