1266635412 has 72 divisors (see below), whose sum is σ = 3665328576. Its totient is φ = 361286784.

The previous prime is 1266635401. The next prime is 1266635429. The reversal of 1266635412 is 2145366621.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 in 23 ways as a sum of consecutive naturals, for example, 158128 + ... + 165944.

Almost surely, 2^1266635412 is an apocalyptic number.

1266635412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266635412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1832664288).

1266635412 is an abundant number, since it is smaller than the sum of its proper divisors (2398693164).

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

1266635412 is a wasteful number, since it uses less digits than its factorization.

1266635412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8477 (or 8472 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 1266635412 is about 35589.8217472355. The cubic root of 1266635412 is about 1081.9749562277.

The spelling of 1266635412 in words is "one billion, two hundred sixty-six million, six hundred thirty-five thousand, four hundred twelve".