256105448997 has 4 divisors (see below), whose sum is σ = 341473932000. Its totient is φ = 170736965996.

The previous prime is 256105448993. The next prime is 256105449001. The reversal of 256105448997 is 799844501652.

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 an interprime number because it is at equal distance from previous prime (256105448993) and next prime (256105449001).

It is a cyclic number.

It is not a de Polignac number, because 256105448997 - 2² = 256105448993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256105448997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256105448993) 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, 42684241497 + ... + 42684241502.

It is an arithmetic number, because the mean of its divisors is an integer number (85368483000).

Almost surely, 2^256105448997 is an apocalyptic number.

It is an amenable number.

256105448997 is a deficient number, since it is larger than the sum of its proper divisors (85368483003).

256105448997 is an equidigital number, since it uses as much as digits as its factorization.

256105448997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85368483002.

The product of its (nonzero) digits is 21772800, while the sum is 60.

The spelling of 256105448997 in words is "two hundred fifty-six billion, one hundred five million, four hundred forty-eight thousand, nine hundred ninety-seven".