257433269621 has 4 divisors (see below), whose sum is σ = 280836294144. Its totient is φ = 234030245100.

The previous prime is 257433269603. The next prime is 257433269633. The reversal of 257433269621 is 126962334752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 257433269621 - 2⁶ = 257433269557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257433269621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257433269221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11701512245 + ... + 11701512266.

It is an arithmetic number, because the mean of its divisors is an integer number (70209073536).

Almost surely, 2^257433269621 is an apocalyptic number.

It is an amenable number.

257433269621 is a deficient number, since it is larger than the sum of its proper divisors (23403024523).

257433269621 is a wasteful number, since it uses less digits than its factorization.

257433269621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23403024522.

The product of its digits is 3265920, while the sum is 50.

The spelling of 257433269621 in words is "two hundred fifty-seven billion, four hundred thirty-three million, two hundred sixty-nine thousand, six hundred twenty-one".