11661201021067 has 4 divisors (see below), whose sum is σ = 12558216484240. Its totient is φ = 10764185557896.

The previous prime is 11661201021013. The next prime is 11661201021079. The reversal of 11661201021067 is 76012010216611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11661201021067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11661201621067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448507731567 + ... + 448507731592.

It is an arithmetic number, because the mean of its divisors is an integer number (3139554121060).

Almost surely, 2^{11661201021067} is an apocalyptic number.

11661201021067 is a deficient number, since it is larger than the sum of its proper divisors (897015463173).

11661201021067 is an equidigital number, since it uses as much as digits as its factorization.

11661201021067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897015463172.

The product of its (nonzero) digits is 6048, while the sum is 34.

Adding to 11661201021067 its reverse (76012010216611), we get a palindrome (87673211237678).

The spelling of 11661201021067 in words is "eleven trillion, six hundred sixty-one billion, two hundred one million, twenty-one thousand, sixty-seven".