1256621325107 has 2 divisors, whose sum is σ = 1256621325108. Its totient is φ = 1256621325106.

The previous prime is 1256621325103. The next prime is 1256621325137. The reversal of 1256621325107 is 7015231266521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1256621325107 - 2² = 1256621325103 is a prime.

It is a super-2 number, since 2×1256621325107² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1256621325103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628310662553 + 628310662554.

It is an arithmetic number, because the mean of its divisors is an integer number (628310662554).

Almost surely, 2^{1256621325107} is an apocalyptic number.

1256621325107 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256621325107 is an equidigital number, since it uses as much as digits as its factorization.

1256621325107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 1256621325107 in words is "one trillion, two hundred fifty-six billion, six hundred twenty-one million, three hundred twenty-five thousand, one hundred seven".