1220545511100 has 90 divisors (see below), whose sum is σ = 3956526382424. Its totient is φ = 325478800800.

The previous prime is 1220545511099. The next prime is 1220545511161. The reversal of 1220545511100 is 11155450221.

It is a happy number.

1220545511100 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 5 + 4 + 551 + 1 + 100 = 666.

It is a tau number, because it is divible by the number of its divisors (90).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 75334216 + ... + 75350415.

Almost surely, 2^{1220545511100} is an apocalyptic number.

1220545511100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220545511100 is an abundant number, since it is smaller than the sum of its proper divisors (2735980871324).

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

1220545511100 is a wasteful number, since it uses less digits than its factorization.

1220545511100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150684657 (or 150684641 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The spelling of 1220545511100 in words is "one trillion, two hundred twenty billion, five hundred forty-five million, five hundred eleven thousand, one hundred".