1647680161161 has 4 divisors (see below), whose sum is σ = 2196906881552. Its totient is φ = 1098453440772.

The previous prime is 1647680161133. The next prime is 1647680161189. The reversal of 1647680161161 is 1611610867461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1647680161133) and next prime (1647680161189).

It is not a de Polignac number, because 1647680161161 - 2⁵ = 1647680161129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1647680161161.

It is not an unprimeable number, because it can be changed into a prime (1647680161121) 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 3 ways as a sum of consecutive naturals, for example, 274613360191 + ... + 274613360196.

It is an arithmetic number, because the mean of its divisors is an integer number (549226720388).

Almost surely, 2^{1647680161161} is an apocalyptic number.

It is an amenable number.

1647680161161 is a deficient number, since it is larger than the sum of its proper divisors (549226720391).

1647680161161 is an equidigital number, since it uses as much as digits as its factorization.

1647680161161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549226720390.

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 1647680161161 in words is "one trillion, six hundred forty-seven billion, six hundred eighty million, one hundred sixty-one thousand, one hundred sixty-one".