161625000489 has 4 divisors (see below), whose sum is σ = 215500000656. Its totient is φ = 107750000324.

The previous prime is 161625000469. The next prime is 161625000497. The reversal of 161625000489 is 984000526161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 984000526161 = 3 ⋅328000175387.

It is a cyclic number.

It is not a de Polignac number, because 161625000489 - 2⁵ = 161625000457 is a prime.

It is a super-2 number, since 2×161625000489² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161625000489.

It is not an unprimeable number, because it can be changed into a prime (161625000409) 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 in 3 ways as a sum of consecutive naturals, for example, 26937500079 + ... + 26937500084.

It is an arithmetic number, because the mean of its divisors is an integer number (53875000164).

Almost surely, 2^161625000489 is an apocalyptic number.

It is an amenable number.

161625000489 is a deficient number, since it is larger than the sum of its proper divisors (53875000167).

161625000489 is an equidigital number, since it uses as much as digits as its factorization.

161625000489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53875000166.

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 161625000489 in words is "one hundred sixty-one billion, six hundred twenty-five million, four hundred eighty-nine", and thus it is an aban number.