1025256144217 has 4 divisors (see below), whose sum is σ = 1025260621840. Its totient is φ = 1025251666596.

The previous prime is 1025256144151. The next prime is 1025256144259. The reversal of 1025256144217 is 7124416525201.

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 1025256144217 - 2³¹ = 1023108660569 is a prime.

It is a super-2 number, since 2×1025256144217² (a number of 25 digits) contains 22 as substring.

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 1025256144217.

It is not an unprimeable number, because it can be changed into a prime (1025256144817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1875723 + ... + 2359840.

It is an arithmetic number, because the mean of its divisors is an integer number (256315155460).

Almost surely, 2^{1025256144217} is an apocalyptic number.

It is an amenable number.

1025256144217 is a deficient number, since it is larger than the sum of its proper divisors (4477623).

1025256144217 is an equidigital number, since it uses as much as digits as its factorization.

1025256144217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4477622.

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 1025256144217 in words is "one trillion, twenty-five billion, two hundred fifty-six million, one hundred forty-four thousand, two hundred seventeen".