256300071749 has 4 divisors (see below), whose sum is σ = 256908860940. Its totient is φ = 255691282560.

The previous prime is 256300071739. The next prime is 256300071793. The reversal of 256300071749 is 947170003652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 109863742849 + 146436328900 = 331457^2 + 382670^2 .

It is a cyclic number.

It is not a de Polignac number, because 256300071749 - 2²⁸ = 256031636293 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 (256300071739) 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, 304393964 + ... + 304394805.

It is an arithmetic number, because the mean of its divisors is an integer number (64227215235).

Almost surely, 2^256300071749 is an apocalyptic number.

It is an amenable number.

256300071749 is a deficient number, since it is larger than the sum of its proper divisors (608789191).

256300071749 is an equidigital number, since it uses as much as digits as its factorization.

256300071749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608789190.

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 256300071749 in words is "two hundred fifty-six billion, three hundred million, seventy-one thousand, seven hundred forty-nine".