1772212166561 has 8 divisors (see below), whose sum is σ = 1774896896640. Its totient is φ = 1769527959408.

The previous prime is 1772212166441. The next prime is 1772212166579. The reversal of 1772212166561 is 1656612122771.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1772212166561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1772212160561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6941210 + ... + 7191996.

It is an arithmetic number, because the mean of its divisors is an integer number (221862112080).

Almost surely, 2^{1772212166561} is an apocalyptic number.

It is an amenable number.

1772212166561 is a deficient number, since it is larger than the sum of its proper divisors (2684730079).

1772212166561 is an equidigital number, since it uses as much as digits as its factorization.

1772212166561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261463.

The product of its digits is 423360, while the sum is 47.

The spelling of 1772212166561 in words is "one trillion, seven hundred seventy-two billion, two hundred twelve million, one hundred sixty-six thousand, five hundred sixty-one".