1267666647 has 16 divisors (see below), whose sum is σ = 1883007840. Its totient is φ = 753201792.

The previous prime is 1267666619. The next prime is 1267666649. The reversal of 1267666647 is 7466667621.

It is not a de Polignac number, because 1267666647 - 2⁸ = 1267666391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1267666647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1267666649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559288 + ... + 561549.

It is an arithmetic number, because the mean of its divisors is an integer number (117687990).

Almost surely, 2^1267666647 is an apocalyptic number.

1267666647 is a deficient number, since it is larger than the sum of its proper divisors (615341193).

1267666647 is a wasteful number, since it uses less digits than its factorization.

1267666647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120882.

The product of its digits is 3048192, while the sum is 51.

The square root of 1267666647 is about 35604.3065794013. The cubic root of 1267666647 is about 1082.2685076232.

The spelling of 1267666647 in words is "one billion, two hundred sixty-seven million, six hundred sixty-six thousand, six hundred forty-seven".