1266801916 has 6 divisors (see below), whose sum is σ = 2216903360. Its totient is φ = 633400956.

The previous prime is 1266801901. The next prime is 1266801917. The reversal of 1266801916 is 6191086621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266801917) by changing a digit.

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, 158350236 + ... + 158350243.

Almost surely, 2^1266801916 is an apocalyptic number.

It is an amenable number.

1266801916 is a deficient number, since it is larger than the sum of its proper divisors (950101444).

1266801916 is a wasteful number, since it uses less digits than its factorization.

1266801916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316700483 (or 316700481 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1266801916 is about 35592.1608784856. The cubic root of 1266801916 is about 1082.0223640461.

The spelling of 1266801916 in words is "one billion, two hundred sixty-six million, eight hundred one thousand, nine hundred sixteen".