1123455666780 has 192 divisors, whose sum is σ = 3797836492800. Its totient is φ = 274664805120.

The previous prime is 1123455666721. The next prime is 1123455666829. The reversal of 1123455666780 is 876665543211.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1448047 + ... + 2084166.

It is an arithmetic number, because the mean of its divisors is an integer number (19780398400).

Almost surely, 2^{1123455666780} is an apocalyptic number.

1123455666780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123455666780 is an abundant number, since it is smaller than the sum of its proper divisors (2674380826020).

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

1123455666780 is a wasteful number, since it uses less digits than its factorization.

1123455666780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3532281 (or 3532273 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 54.

The spelling of 1123455666780 in words is "one trillion, one hundred twenty-three billion, four hundred fifty-five million, six hundred sixty-six thousand, seven hundred eighty".