1211004955556 has 96 divisors (see below), whose sum is σ = 2540721254400. Its totient is φ = 498553989120.

The previous prime is 1211004955541. The next prime is 1211004955577. The reversal of 1211004955556 is 6555594001121.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39652100 + ... + 39682628.

It is an arithmetic number, because the mean of its divisors is an integer number (26465846400).

Almost surely, 2^{1211004955556} is an apocalyptic number.

It is an amenable number.

1211004955556 is an abundant number, since it is smaller than the sum of its proper divisors (1329716298844).

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

1211004955556 is a wasteful number, since it uses less digits than its factorization.

1211004955556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32649 (or 32647 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 44.

Adding to 1211004955556 its reverse (6555594001121), we get a palindrome (7766598956677).

The spelling of 1211004955556 in words is "one trillion, two hundred eleven billion, four million, nine hundred fifty-five thousand, five hundred fifty-six".