1261567166267 has 4 divisors (see below), whose sum is σ = 1261569587256. Its totient is φ = 1261564745280.

The previous prime is 1261567166231. The next prime is 1261567166273. The reversal of 1261567166267 is 7626617651621.

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

It is a cyclic number.

It is not a de Polignac number, because 1261567166267 - 2¹² = 1261567162171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261567166207) 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, 71798 + ... + 1590059.

It is an arithmetic number, because the mean of its divisors is an integer number (315392396814).

Almost surely, 2^{1261567166267} is an apocalyptic number.

1261567166267 is a deficient number, since it is larger than the sum of its proper divisors (2420989).

1261567166267 is an equidigital number, since it uses as much as digits as its factorization.

1261567166267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420988.

The product of its digits is 7620480, while the sum is 56.

The spelling of 1261567166267 in words is "one trillion, two hundred sixty-one billion, five hundred sixty-seven million, one hundred sixty-six thousand, two hundred sixty-seven".