1200556553556 has 12 divisors (see below), whose sum is σ = 2801298624992. Its totient is φ = 400185517848.

The previous prime is 1200556553509. The next prime is 1200556553557. The reversal of 1200556553556 is 6553556550021.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200556553557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50023189720 + ... + 50023189743.

Almost surely, 2^{1200556553556} is an apocalyptic number.

It is an amenable number.

1200556553556 is an abundant number, since it is smaller than the sum of its proper divisors (1600742071436).

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

1200556553556 is a wasteful number, since it uses less digits than its factorization.

1200556553556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100046379470 (or 100046379468 counting only the distinct ones).

The product of its (nonzero) digits is 3375000, while the sum is 48.

The spelling of 1200556553556 in words is "one trillion, two hundred billion, five hundred fifty-six million, five hundred fifty-three thousand, five hundred fifty-six".