1266928025017 has 4 divisors (see below), whose sum is σ = 1297828708596. Its totient is φ = 1236027341440.

The previous prime is 1266928024937. The next prime is 1266928025023. The reversal of 1266928025017 is 7105208296621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 484532935056 + 782395089961 = 696084^2 + 884531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266928025017 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266928025047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15450341728 + ... + 15450341809.

It is an arithmetic number, because the mean of its divisors is an integer number (324457177149).

Almost surely, 2^{1266928025017} is an apocalyptic number.

It is an amenable number.

1266928025017 is a deficient number, since it is larger than the sum of its proper divisors (30900683579).

1266928025017 is an equidigital number, since it uses as much as digits as its factorization.

1266928025017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30900683578.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 1266928025017 in words is "one trillion, two hundred sixty-six billion, nine hundred twenty-eight million, twenty-five thousand, seventeen".