1267671667 has 4 divisors (see below), whose sum is σ = 1269235576. Its totient is φ = 1266107760.

The previous prime is 1267671641. The next prime is 1267671719. The reversal of 1267671667 is 7661767621.

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 1267671667 - 2⁷ = 1267671539 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1267671667.

It is not an unprimeable number, because it can be changed into a prime (1267671617) 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, 780738 + ... + 782359.

It is an arithmetic number, because the mean of its divisors is an integer number (317308894).

Almost surely, 2^1267671667 is an apocalyptic number.

1267671667 is a deficient number, since it is larger than the sum of its proper divisors (1563909).

1267671667 is an equidigital number, since it uses as much as digits as its factorization.

1267671667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563908.

The product of its digits is 889056, while the sum is 49.

The square root of 1267671667 is about 35604.3770764214. The cubic root of 1267671667 is about 1082.2699362271.

The spelling of 1267671667 in words is "one billion, two hundred sixty-seven million, six hundred seventy-one thousand, six hundred sixty-seven".