161018786601 has 16 divisors (see below), whose sum is σ = 251101422400. Its totient is φ = 101696075424.

The previous prime is 161018786587. The next prime is 161018786603. The reversal of 161018786601 is 106687810161.

161018786601 is a `hidden beast` number, since 16 + 10 + 18 + 7 + 8 + 6 + 601 = 666.

It is not a de Polignac number, because 161018786601 - 2¹⁷ = 161018655529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161018786603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156937876 + ... + 156938901.

It is an arithmetic number, because the mean of its divisors is an integer number (15693838900).

Almost surely, 2^161018786601 is an apocalyptic number.

It is an amenable number.

161018786601 is a deficient number, since it is larger than the sum of its proper divisors (90082635799).

161018786601 is a wasteful number, since it uses less digits than its factorization.

161018786601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313876805 (or 313876799 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The spelling of 161018786601 in words is "one hundred sixty-one billion, eighteen million, seven hundred eighty-six thousand, six hundred one".