161628000649 has 2 divisors, whose sum is σ = 161628000650. Its totient is φ = 161628000648.

The previous prime is 161628000643. The next prime is 161628000683. The reversal of 161628000649 is 946000826161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98592860025 + 63035140624 = 313995^2 + 251068^2 .

It is an emirp because it is prime and its reverse (946000826161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161628000649 - 2²⁵ = 161594446217 is a prime.

It is a super-2 number, since 2×161628000649² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161628000643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80814000324 + 80814000325.

It is an arithmetic number, because the mean of its divisors is an integer number (80814000325).

Almost surely, 2^161628000649 is an apocalyptic number.

It is an amenable number.

161628000649 is a deficient number, since it is larger than the sum of its proper divisors (1).

161628000649 is an equidigital number, since it uses as much as digits as its factorization.

161628000649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 161628000649 in words is "one hundred sixty-one billion, six hundred twenty-eight million, six hundred forty-nine", and thus it is an aban number.