1213051461666 has 64 divisors (see below), whose sum is σ = 2657677392000. Its totient is φ = 366064025600.

The previous prime is 1213051461659. The next prime is 1213051461683. The reversal of 1213051461666 is 6661641503121.

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, 15400030 + ... + 15478598.

It is an arithmetic number, because the mean of its divisors is an integer number (41526209250).

Almost surely, 2^{1213051461666} is an apocalyptic number.

1213051461666 is an abundant number, since it is smaller than the sum of its proper divisors (1444625930334).

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

1213051461666 is a wasteful number, since it uses less digits than its factorization.

1213051461666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79555.

The product of its (nonzero) digits is 155520, while the sum is 42.

Adding to 1213051461666 its reverse (6661641503121), we get a palindrome (7874692964787).

The spelling of 1213051461666 in words is "one trillion, two hundred thirteen billion, fifty-one million, four hundred sixty-one thousand, six hundred sixty-six".