1266145672 has 32 divisors (see below), whose sum is σ = 2591225280. Its totient is φ = 575213760.

The previous prime is 1266145663. The next prime is 1266145687. The reversal of 1266145672 is 2765416621.

It is a happy 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 in 7 ways as a sum of consecutive naturals, for example, 284053 + ... + 288475.

It is an arithmetic number, because the mean of its divisors is an integer number (80975790).

Almost surely, 2^1266145672 is an apocalyptic number.

It is an amenable number.

1266145672 is an abundant number, since it is smaller than the sum of its proper divisors (1325079608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1266145672 is a wasteful number, since it uses less digits than its factorization.

1266145672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7693 (or 7689 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 1266145672 is about 35582.9407441263. The cubic root of 1266145672 is about 1081.8354910173.

The spelling of 1266145672 in words is "one billion, two hundred sixty-six million, one hundred forty-five thousand, six hundred seventy-two".