257643012745 has 16 divisors (see below), whose sum is σ = 309671174592. Its totient is φ = 205781647680.

The previous prime is 257643012743. The next prime is 257643012779. The reversal of 257643012745 is 547210346752.

It is not a de Polignac number, because 257643012745 - 2¹ = 257643012743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 257643012695 and 257643012704.

It is not an unprimeable number, because it can be changed into a prime (257643012743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8014474 + ... + 8046556.

It is an arithmetic number, because the mean of its divisors is an integer number (19354448412).

Almost surely, 2^257643012745 is an apocalyptic number.

It is an amenable number.

257643012745 is a deficient number, since it is larger than the sum of its proper divisors (52028161847).

257643012745 is a wasteful number, since it uses less digits than its factorization.

257643012745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34632.

The product of its (nonzero) digits is 1411200, while the sum is 46.

The spelling of 257643012745 in words is "two hundred fifty-seven billion, six hundred forty-three million, twelve thousand, seven hundred forty-five".