257221861035 has 32 divisors (see below), whose sum is σ = 423952531200. Its totient is φ = 133095301248.

The previous prime is 257221861031. The next prime is 257221861037. The reversal of 257221861035 is 530168122752.

It is not a de Polignac number, because 257221861035 - 2² = 257221861031 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257221861031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1242129 + ... + 1434338.

It is an arithmetic number, because the mean of its divisors is an integer number (13248516600).

Almost surely, 2^257221861035 is an apocalyptic number.

257221861035 is a deficient number, since it is larger than the sum of its proper divisors (166730670165).

257221861035 is a wasteful number, since it uses less digits than its factorization.

257221861035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2676667.

The product of its (nonzero) digits is 201600, while the sum is 42.

Adding to 257221861035 its reverse (530168122752), we get a palindrome (787389983787).

The spelling of 257221861035 in words is "two hundred fifty-seven billion, two hundred twenty-one million, eight hundred sixty-one thousand, thirty-five".