257996699693 has 8 divisors (see below), whose sum is σ = 259893153912. Its totient is φ = 256100438016.

The previous prime is 257996699689. The next prime is 257996699729. The reversal of 257996699693 is 396996699752.

It can be written as a sum of positive squares in 4 ways, for example, as 48359088649 + 209637611044 = 219907^2 + 457862^2 .

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 257996699693 - 2² = 257996699689 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257996699893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3719021 + ... + 3787757.

It is an arithmetic number, because the mean of its divisors is an integer number (32486644239).

Almost surely, 2^257996699693 is an apocalyptic number.

It is an amenable number.

257996699693 is a deficient number, since it is larger than the sum of its proper divisors (1896454219).

257996699693 is a wasteful number, since it uses less digits than its factorization.

257996699693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96271.

The product of its digits is 2678462640, while the sum is 80.

The spelling of 257996699693 in words is "two hundred fifty-seven billion, nine hundred ninety-six million, six hundred ninety-nine thousand, six hundred ninety-three".