1266799600 has 120 divisors (see below), whose sum is σ = 3347785728. Its totient is φ = 456825600.

The previous prime is 1266799577. The next prime is 1266799603. The reversal of 1266799600 is 69976621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266799603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 557667 + ... + 559933.

Almost surely, 2^1266799600 is an apocalyptic number.

1266799600 is a gapful number since it is divisible by the number (10) 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 1266799600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1673892864).

1266799600 is an abundant number, since it is smaller than the sum of its proper divisors (2080986128).

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

1266799600 is a wasteful number, since it uses less digits than its factorization.

1266799600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423 (or 2412 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 1266799600 is about 35592.1283432166. The cubic root of 1266799600 is about 1082.0217046519.

The spelling of 1266799600 in words is "one billion, two hundred sixty-six million, seven hundred ninety-nine thousand, six hundred".