1261353600000 has 1056 divisors, whose sum is σ = 5032739134080. Its totient is φ = 310210560000.

The previous prime is 1261353599999. The next prime is 1261353600053. The reversal of 1261353600000 is 63531621.

1261353600000 is a `hidden beast` number, since 1 + 2 + 6 + 1 + 3 + 53 + 600 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1123199439 + ... + 1123200561.

Almost surely, 2^{1261353600000} is an apocalyptic number.

1261353600000 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 1261353600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2516369567040).

1261353600000 is an abundant number, since it is smaller than the sum of its proper divisors (3771385534080).

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

1261353600000 is an equidigital number, since it uses as much as digits as its factorization.

1261353600000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190 (or 1146 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The spelling of 1261353600000 in words is "one trillion, two hundred sixty-one billion, three hundred fifty-three million, six hundred thousand".