1266136672 has 12 divisors (see below), whose sum is σ = 2492706636. Its totient is φ = 633068320.

The previous prime is 1266136609. The next prime is 1266136699. The reversal of 1266136672 is 2766316621.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19783354 + ... + 19783417.

It is an arithmetic number, because the mean of its divisors is an integer number (207725553).

Almost surely, 2^1266136672 is an apocalyptic number.

It is an amenable number.

1266136672 is a deficient number, since it is larger than the sum of its proper divisors (1226569964).

1266136672 is an equidigital number, since it uses as much as digits as its factorization.

1266136672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39566781 (or 39566773 counting only the distinct ones).

The product of its digits is 108864, while the sum is 40.

The square root of 1266136672 is about 35582.8142788060. The cubic root of 1266136672 is about 1081.8329277150.

The spelling of 1266136672 in words is "one billion, two hundred sixty-six million, one hundred thirty-six thousand, six hundred seventy-two".