1227155961600 has 810 divisors, whose sum is σ = 4820546576384. Its totient is φ = 307954483200.

The previous prime is 1227155961557. The next prime is 1227155961659. The reversal of 1227155961600 is 61695517221.

It is a happy number.

1227155961600 is a `hidden beast` number, since 1 + 2 + 27 + 1 + 5 + 5 + 9 + 616 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (810).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 149813505 + ... + 149821695.

Almost surely, 2^{1227155961600} is an apocalyptic number.

1227155961600 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 1227155961600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2410273288192).

1227155961600 is an abundant number, since it is smaller than the sum of its proper divisors (3593390614784).

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

1227155961600 is an equidigital number, since it uses as much as digits as its factorization.

1227155961600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8263 (or 8218 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The spelling of 1227155961600 in words is "one trillion, two hundred twenty-seven billion, one hundred fifty-five million, nine hundred sixty-one thousand, six hundred".