1664154514661 has 12 divisors (see below), whose sum is σ = 1756656107712. Its totient is φ = 1576293954984.

The previous prime is 1664154514609. The next prime is 1664154514667.

1664154514661 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-1664154514661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664154514667) 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 11 ways as a sum of consecutive naturals, for example, 1699406 + ... + 2493248.

It is an arithmetic number, because the mean of its divisors is an integer number (146388008976).

Almost surely, 2^{1664154514661} is an apocalyptic number.

It is an amenable number.

1664154514661 is a deficient number, since it is larger than the sum of its proper divisors (92501593051).

1664154514661 is an equidigital number, since it uses as much as digits as its factorization.

1664154514661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799688 (or 799669 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 50.

The spelling of 1664154514661 in words is "one trillion, six hundred sixty-four billion, one hundred fifty-four million, five hundred fourteen thousand, six hundred sixty-one".