1211641053556 has 24 divisors (see below), whose sum is σ = 2196672697856. Its totient is φ = 584161385760.

The previous prime is 1211641053541. The next prime is 1211641053583. The reversal of 1211641053556 is 6553501461121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17603376 + ... + 17672071.

Almost surely, 2^{1211641053556} is an apocalyptic number.

It is an amenable number.

1211641053556 is a deficient number, since it is larger than the sum of its proper divisors (985031644300).

1211641053556 is a wasteful number, since it uses less digits than its factorization.

1211641053556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35275759 (or 35275757 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 1211641053556 in words is "one trillion, two hundred eleven billion, six hundred forty-one million, fifty-three thousand, five hundred fifty-six".