1267987426897 has 4 divisors (see below), whose sum is σ = 1334723607280. Its totient is φ = 1201251246516.

The previous prime is 1267987426873. The next prime is 1267987426907. The reversal of 1267987426897 is 7986247897621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1267987426897 is a prime.

It is a super-2 number, since 2×1267987426897² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1267987423897) 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, 33368090163 + ... + 33368090200.

It is an arithmetic number, because the mean of its divisors is an integer number (333680901820).

Almost surely, 2^{1267987426897} is an apocalyptic number.

It is an amenable number.

1267987426897 is a deficient number, since it is larger than the sum of its proper divisors (66736180383).

1267987426897 is an equidigital number, since it uses as much as digits as its factorization.

1267987426897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66736180382.

The product of its digits is 1024192512, while the sum is 76.

The spelling of 1267987426897 in words is "one trillion, two hundred sixty-seven billion, nine hundred eighty-seven million, four hundred twenty-six thousand, eight hundred ninety-seven".