1256621325137 has 2 divisors, whose sum is σ = 1256621325138. Its totient is φ = 1256621325136.

The previous prime is 1256621325107. The next prime is 1256621325221. The reversal of 1256621325137 is 7315231266521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1113043990081 + 143577335056 = 1055009^2 + 378916^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256621325137 - 2⁶ = 1256621325073 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256621325107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628310662568 + 628310662569.

It is an arithmetic number, because the mean of its divisors is an integer number (628310662569).

Almost surely, 2^{1256621325137} is an apocalyptic number.

It is an amenable number.

1256621325137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256621325137 is an equidigital number, since it uses as much as digits as its factorization.

1256621325137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 44.

The spelling of 1256621325137 in words is "one trillion, two hundred fifty-six billion, six hundred twenty-one million, three hundred twenty-five thousand, one hundred thirty-seven".