1243434205666 has 32 divisors (see below), whose sum is σ = 1909730769408. Its totient is φ = 607023728640.

The previous prime is 1243434205661. The next prime is 1243434205703. The reversal of 1243434205666 is 6665024343421.

It is a happy number.

It is a super-2 number, since 2×1243434205666² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1243434205661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9374626 + ... + 9506338.

It is an arithmetic number, because the mean of its divisors is an integer number (59679086544).

Almost surely, 2^{1243434205666} is an apocalyptic number.

1243434205666 is a deficient number, since it is larger than the sum of its proper divisors (666296563742).

1243434205666 is a wasteful number, since it uses less digits than its factorization.

1243434205666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132346.

The product of its (nonzero) digits is 2488320, while the sum is 46.

The spelling of 1243434205666 in words is "one trillion, two hundred forty-three billion, four hundred thirty-four million, two hundred five thousand, six hundred sixty-six".