1266336621 has 48 divisors (see below), whose sum is σ = 2039132160. Its totient is φ = 750850560.

The previous prime is 1266336607. The next prime is 1266336629.

1266336621 is a `hidden beast` number, since 1 + 26 + 6 + 3 + 3 + 6 + 621 = 666.

1266336621 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1266336621 - 2⁷ = 1266336493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266336629) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 989460 + ... + 990738.

It is an arithmetic number, because the mean of its divisors is an integer number (42481920).

Almost surely, 2^1266336621 is an apocalyptic number.

1266336621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1266336621 is a deficient number, since it is larger than the sum of its proper divisors (772795539).

1266336621 is a wasteful number, since it uses less digits than its factorization.

1266336621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506 (or 1503 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 1266336621 is about 35585.6237966963. The cubic root of 1266336621 is about 1081.8898726013.

It can be divided in two parts, 12663 and 36621, that added together give a square (49284 = 222²).

The spelling of 1266336621 in words is "one billion, two hundred sixty-six million, three hundred thirty-six thousand, six hundred twenty-one".