161796653 has 2 divisors, whose sum is σ = 161796654. Its totient is φ = 161796652.

The previous prime is 161796643. The next prime is 161796707. The reversal of 161796653 is 356697161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158709604 + 3087049 = 12598^2 + 1757^2 .

It is an emirp because it is prime and its reverse (356697161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161796653 - 2⁴ = 161796637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161796643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80898326 + 80898327.

It is an arithmetic number, because the mean of its divisors is an integer number (80898327).

Almost surely, 2^161796653 is an apocalyptic number.

It is an amenable number.

161796653 is a deficient number, since it is larger than the sum of its proper divisors (1).

161796653 is an equidigital number, since it uses as much as digits as its factorization.

161796653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 44.

The square root of 161796653 is about 12719.9313284310. The cubic root of 161796653 is about 544.9079922114.

The spelling of 161796653 in words is "one hundred sixty-one million, seven hundred ninety-six thousand, six hundred fifty-three".