161016778898 has 16 divisors (see below), whose sum is σ = 243015318936. Its totient is φ = 80012033280.

The previous prime is 161016778877. The next prime is 161016778919. The reversal of 161016778898 is 898877610161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (161016778877) and next prime (161016778919).

It can be written as a sum of positive squares in 4 ways, for example, as 160659077329 + 357701569 = 400823^2 + 18913^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 161016778898.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 818090 + ... + 995642.

Almost surely, 2^161016778898 is an apocalyptic number.

161016778898 is a deficient number, since it is larger than the sum of its proper divisors (81998540038).

161016778898 is a wasteful number, since it uses less digits than its factorization.

161016778898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180349.

The product of its (nonzero) digits is 8128512, while the sum is 62.

The spelling of 161016778898 in words is "one hundred sixty-one billion, sixteen million, seven hundred seventy-eight thousand, eight hundred ninety-eight".