1223749555200 has 924 divisors, whose sum is σ = 4747450676448. Its totient is φ = 312035328000.

The previous prime is 1223749555181. The next prime is 1223749555243. The reversal of 1223749555200 is 25559473221.

1223749555200 is a `hidden beast` number, since 1 + 2 + 2 + 3 + 7 + 4 + 95 + 552 + 0 + 0 = 666.

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 polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 429233775 + ... + 429236625.

Almost surely, 2^{1223749555200} is an apocalyptic number.

1223749555200 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 1223749555200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2373725338224).

1223749555200 is an abundant number, since it is smaller than the sum of its proper divisors (3523701121248).

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

1223749555200 is an equidigital number, since it uses as much as digits as its factorization.

1223749555200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2922 (or 2884 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The spelling of 1223749555200 in words is "one trillion, two hundred twenty-three billion, seven hundred forty-nine million, five hundred fifty-five thousand, two hundred".