1266216020 has 12 divisors (see below), whose sum is σ = 2659053684. Its totient is φ = 506486400.

The previous prime is 1266215999. The next prime is 1266216023. The reversal of 1266216020 is 206126621.

It can be written as a sum of positive squares in 2 ways, for example, as 265885636 + 1000330384 = 16306^2 + 31628^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266216023) 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, 31655381 + ... + 31655420.

It is an arithmetic number, because the mean of its divisors is an integer number (221587807).

Almost surely, 2^1266216020 is an apocalyptic number.

1266216020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266216020 is an abundant number, since it is smaller than the sum of its proper divisors (1392837664).

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

1266216020 is a wasteful number, since it uses less digits than its factorization.

1266216020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63310810 (or 63310808 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1266216020 is about 35583.9292377894. The cubic root of 1266216020 is about 1081.8555265091.

It can be divided in two parts, 12662 and 16020, that added together give a palindrome (28682).

The spelling of 1266216020 in words is "one billion, two hundred sixty-six million, two hundred sixteen thousand, twenty".