1266120000 has 210 divisors, whose sum is σ = 4536218258. Its totient is φ = 337536000.

The previous prime is 1266119989. The next prime is 1266120017. The reversal of 1266120000 is 216621.

It is a happy number.

1266120000 is a `hidden beast` number, since 1 + 2 + 661 + 2 + 0 + 0 + 0 + 0 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 178703424 + 1087416576 = 13368^2 + 32976^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 358242 + ... + 361758.

Almost surely, 2^1266120000 is an apocalyptic number.

1266120000 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 1266120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2268109129).

1266120000 is an abundant number, since it is smaller than the sum of its proper divisors (3270098258).

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

1266120000 is an equidigital number, since it uses as much as digits as its factorization.

1266120000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3555 (or 3527 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1266120000 is about 35582.5800076386. The cubic root of 1266120000 is about 1081.8281793077.

Adding to 1266120000 its reverse (216621), we get a palindrome (1266336621).

The spelling of 1266120000 in words is "one billion, two hundred sixty-six million, one hundred twenty thousand".