1264737785617 has 2 divisors, whose sum is σ = 1264737785618. Its totient is φ = 1264737785616.

The previous prime is 1264737785599. The next prime is 1264737785677. The reversal of 1264737785617 is 7165877374621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1251677638656 + 13060146961 = 1118784^2 + 114281^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264737785617 - 2¹⁵ = 1264737752849 is a prime.

It is not a weakly prime, because it can be changed into another prime (1264737785677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632368892808 + 632368892809.

It is an arithmetic number, because the mean of its divisors is an integer number (632368892809).

Almost surely, 2^{1264737785617} is an apocalyptic number.

It is an amenable number.

1264737785617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264737785617 is an equidigital number, since it uses as much as digits as its factorization.

1264737785617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82978560, while the sum is 64.

The spelling of 1264737785617 in words is "one trillion, two hundred sixty-four billion, seven hundred thirty-seven million, seven hundred eighty-five thousand, six hundred seventeen".