1267251499999 has 2 divisors, whose sum is σ = 1267251500000. Its totient is φ = 1267251499998.

The previous prime is 1267251499951. The next prime is 1267251500027. The reversal of 1267251499999 is 9999941527621.

It is a strong prime.

It is an emirp because it is prime and its reverse (9999941527621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1267251499999 - 2²³ = 1267243111391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1267251499919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633625749999 + 633625750000.

It is an arithmetic number, because the mean of its divisors is an integer number (633625750000).

Almost surely, 2^{1267251499999} is an apocalyptic number.

1267251499999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267251499999 is an equidigital number, since it uses as much as digits as its factorization.

1267251499999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 198404640, while the sum is 73.

The spelling of 1267251499999 in words is "one trillion, two hundred sixty-seven billion, two hundred fifty-one million, four hundred ninety-nine thousand, nine hundred ninety-nine".