1256865515925 has 48 divisors (see below), whose sum is σ = 2104627200000. Its totient is φ = 661747020480.

The previous prime is 1256865515923. The next prime is 1256865515933. The reversal of 1256865515925 is 5295155686521.

It is not a de Polignac number, because 1256865515925 - 2¹ = 1256865515923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256865515921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61603876 + ... + 61624274.

It is an arithmetic number, because the mean of its divisors is an integer number (43846400000).

Almost surely, 2^{1256865515925} is an apocalyptic number.

1256865515925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1256865515925 is a deficient number, since it is larger than the sum of its proper divisors (847761684075).

1256865515925 is a wasteful number, since it uses less digits than its factorization.

1256865515925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30890 (or 30885 counting only the distinct ones).

The product of its digits is 32400000, while the sum is 60.

The spelling of 1256865515925 in words is "one trillion, two hundred fifty-six billion, eight hundred sixty-five million, five hundred fifteen thousand, nine hundred twenty-five".